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Finding the Fourth Proportional to 715,850.39, 987,874.17 and 393,565.97

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Solution

The fourth proportional to 715,850.39, 987,874.17 and 393,565.97 is: 543,121.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,850.39 : 987,874.17 = 393,565.97 : x
  2. Step 2: Convert to fraction form
    715,850.39/987,874.17 = 393,565.97/x
  3. Step 3: Cross multiply
    715,850.39x = 987,874.17 × 393,565.97
  4. Step 4: Simplify right side
    715,850.39x = 388,793,655,954.00
  5. Step 5: Solve for x
    x = 388,793,655,954.00/715,850.39
  6. Step 6: Final answer
    x = 543,121.39

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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.