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Finding the Fourth Proportional to 715,666.97, 987,607.13 and 393,370.17

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Solution

The fourth proportional to 715,666.97, 987,607.13 and 393,370.17 is: 542,843.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,666.97 : 987,607.13 = 393,370.17 : x
  2. Step 2: Convert to fraction form
    715,666.97/987,607.13 = 393,370.17/x
  3. Step 3: Cross multiply
    715,666.97x = 987,607.13 × 393,370.17
  4. Step 4: Simplify right side
    715,666.97x = 388,495,182,654.46
  5. Step 5: Solve for x
    x = 388,495,182,654.46/715,666.97
  6. Step 6: Final answer
    x = 542,843.53

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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.