Home / 1,320,000.20-1,980,000.30-788,121.80

Finding the Fourth Proportional to 1,320,000.20, 1,980,000.30 and 788,121.80

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Solution

The fourth proportional to 1,320,000.20, 1,980,000.30 and 788,121.80 is: 1,182,182.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320,000.20 : 1,980,000.30 = 788,121.80 : x
  2. Step 2: Convert to fraction form
    1,320,000.20/1,980,000.30 = 788,121.80/x
  3. Step 3: Cross multiply
    1,320,000.20x = 1,980,000.30 × 788,121.80
  4. Step 4: Simplify right side
    1,320,000.20x = 1,560,481,400,436.54
  5. Step 5: Solve for x
    x = 1,560,481,400,436.54/1,320,000.20
  6. Step 6: Final answer
    x = 1,182,182.70

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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.