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Finding the Fourth Proportional to 691.20, 953.86 and 392.43

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Solution

The fourth proportional to 691.20, 953.86 and 392.43 is: 541.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.20 : 953.86 = 392.43 : x
  2. Step 2: Convert to fraction form
    691.20/953.86 = 392.43/x
  3. Step 3: Cross multiply
    691.20x = 953.86 × 392.43
  4. Step 4: Simplify right side
    691.20x = 374,323.61
  5. Step 5: Solve for x
    x = 374,323.61/691.20
  6. Step 6: Final answer
    x = 541.56

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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.