Home / 685,999.20-1,028,998.80-212,732.40

Finding the Fourth Proportional to 685,999.20, 1,028,998.80 and 212,732.40

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Solution

The fourth proportional to 685,999.20, 1,028,998.80 and 212,732.40 is: 319,098.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,999.20 : 1,028,998.80 = 212,732.40 : x
  2. Step 2: Convert to fraction form
    685,999.20/1,028,998.80 = 212,732.40/x
  3. Step 3: Cross multiply
    685,999.20x = 1,028,998.80 × 212,732.40
  4. Step 4: Simplify right side
    685,999.20x = 218,901,384,321.12
  5. Step 5: Solve for x
    x = 218,901,384,321.12/685,999.20
  6. Step 6: Final answer
    x = 319,098.60

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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.