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Finding the Fourth Proportional to 715,251.42, 987,053.64 and 392,968.20

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Solution

The fourth proportional to 715,251.42, 987,053.64 and 392,968.20 is: 542,299.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,251.42 : 987,053.64 = 392,968.20 : x
  2. Step 2: Convert to fraction form
    715,251.42/987,053.64 = 392,968.20/x
  3. Step 3: Cross multiply
    715,251.42x = 987,053.64 × 392,968.20
  4. Step 4: Simplify right side
    715,251.42x = 387,880,692,214.25
  5. Step 5: Solve for x
    x = 387,880,692,214.25/715,251.42
  6. Step 6: Final answer
    x = 542,299.79

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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.