Home / 1,290,296,000.80-1,935,444,001.20-428,652,992.80

Finding the Fourth Proportional to 1,290,296,000.80, 1,935,444,001.20 and 428,652,992.80

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Solution

The fourth proportional to 1,290,296,000.80, 1,935,444,001.20 and 428,652,992.80 is: 642,979,489.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,296,000.80 : 1,935,444,001.20 = 428,652,992.80 : x
  2. Step 2: Convert to fraction form
    1,290,296,000.80/1,935,444,001.20 = 428,652,992.80/x
  3. Step 3: Cross multiply
    1,290,296,000.80x = 1,935,444,001.20 × 428,652,992.80
  4. Step 4: Simplify right side
    1,290,296,000.80x = 829,633,863,511,186,816
  5. Step 5: Solve for x
    x = 829,633,863,511,186,816/1,290,296,000.80
  6. Step 6: Final answer
    x = 642,979,489.20

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.