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Finding the Fourth Proportional to 715,201.79, 986,978.87 and 392,932.64

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Solution

The fourth proportional to 715,201.79, 986,978.87 and 392,932.64 is: 542,247.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,201.79 : 986,978.87 = 392,932.64 : x
  2. Step 2: Convert to fraction form
    715,201.79/986,978.87 = 392,932.64/x
  3. Step 3: Cross multiply
    715,201.79x = 986,978.87 × 392,932.64
  4. Step 4: Simplify right side
    715,201.79x = 387,816,213,013.32
  5. Step 5: Solve for x
    x = 387,816,213,013.32/715,201.79
  6. Step 6: Final answer
    x = 542,247.26

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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.