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Finding the Fourth Proportional to 691.28, 953.92 and 411.53

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Solution

The fourth proportional to 691.28, 953.92 and 411.53 is: 567.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.28 : 953.92 = 411.53 : x
  2. Step 2: Convert to fraction form
    691.28/953.92 = 411.53/x
  3. Step 3: Cross multiply
    691.28x = 953.92 × 411.53
  4. Step 4: Simplify right side
    691.28x = 392,564.64
  5. Step 5: Solve for x
    x = 392,564.64/691.28
  6. Step 6: Final answer
    x = 567.88

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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.