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Finding the Fourth Proportional to 715,909.97, 987,946.90 and 393,617.25

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Solution

The fourth proportional to 715,909.97, 987,946.90 and 393,617.25 is: 543,186.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,909.97 : 987,946.90 = 393,617.25 : x
  2. Step 2: Convert to fraction form
    715,909.97/987,946.90 = 393,617.25/x
  3. Step 3: Cross multiply
    715,909.97x = 987,946.90 × 393,617.25
  4. Step 4: Simplify right side
    715,909.97x = 388,872,941,924.03
  5. Step 5: Solve for x
    x = 388,872,941,924.03/715,909.97
  6. Step 6: Final answer
    x = 543,186.93

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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.