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Finding the Fourth Proportional to 715,306.91, 987,120.54 and 393,016.01

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Solution

The fourth proportional to 715,306.91, 987,120.54 and 393,016.01 is: 542,360.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,306.91 : 987,120.54 = 393,016.01 : x
  2. Step 2: Convert to fraction form
    715,306.91/987,120.54 = 393,016.01/x
  3. Step 3: Cross multiply
    715,306.91x = 987,120.54 × 393,016.01
  4. Step 4: Simplify right side
    715,306.91x = 387,954,171,084.24
  5. Step 5: Solve for x
    x = 387,954,171,084.24/715,306.91
  6. Step 6: Final answer
    x = 542,360.44

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.