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Finding the Fourth Proportional to 715,691.36, 987,648.25 and 393,398.03

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Solution

The fourth proportional to 715,691.36, 987,648.25 and 393,398.03 is: 542,886.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,691.36 : 987,648.25 = 393,398.03 : x
  2. Step 2: Convert to fraction form
    715,691.36/987,648.25 = 393,398.03/x
  3. Step 3: Cross multiply
    715,691.36x = 987,648.25 × 393,398.03
  4. Step 4: Simplify right side
    715,691.36x = 388,538,875,882.95
  5. Step 5: Solve for x
    x = 388,538,875,882.95/715,691.36
  6. Step 6: Final answer
    x = 542,886.08

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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.