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Finding the Fourth Proportional to 715,643.28, 987,537.96 and 393,345.36

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Solution

The fourth proportional to 715,643.28, 987,537.96 and 393,345.36 is: 542,789.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,643.28 : 987,537.96 = 393,345.36 : x
  2. Step 2: Convert to fraction form
    715,643.28/987,537.96 = 393,345.36/x
  3. Step 3: Cross multiply
    715,643.28x = 987,537.96 × 393,345.36
  4. Step 4: Simplify right side
    715,643.28x = 388,443,474,389.87
  5. Step 5: Solve for x
    x = 388,443,474,389.87/715,643.28
  6. Step 6: Final answer
    x = 542,789.24

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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.