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Finding the Fourth Proportional to 715,773.12, 987,766.56 and 393,504

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Solution

The fourth proportional to 715,773.12, 987,766.56 and 393,504 is: 543,035.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,773.12 : 987,766.56 = 393,504 : x
  2. Step 2: Convert to fraction form
    715,773.12/987,766.56 = 393,504/x
  3. Step 3: Cross multiply
    715,773.12x = 987,766.56 × 393,504
  4. Step 4: Simplify right side
    715,773.12x = 388,690,092,426.24
  5. Step 5: Solve for x
    x = 388,690,092,426.24/715,773.12
  6. Step 6: Final answer
    x = 543,035.33

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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.