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Finding the Fourth Proportional to 485,387.40, 728,081.10 and 317,425.80

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Solution

The fourth proportional to 485,387.40, 728,081.10 and 317,425.80 is: 476,138.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,387.40 : 728,081.10 = 317,425.80 : x
  2. Step 2: Convert to fraction form
    485,387.40/728,081.10 = 317,425.80/x
  3. Step 3: Cross multiply
    485,387.40x = 728,081.10 × 317,425.80
  4. Step 4: Simplify right side
    485,387.40x = 231,111,725,632.38
  5. Step 5: Solve for x
    x = 231,111,725,632.38/485,387.40
  6. Step 6: Final answer
    x = 476,138.70

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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.