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Finding the Fourth Proportional to 691.53, 954.32 and 411.78

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Solution

The fourth proportional to 691.53, 954.32 and 411.78 is: 568.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.53 : 954.32 = 411.78 : x
  2. Step 2: Convert to fraction form
    691.53/954.32 = 411.78/x
  3. Step 3: Cross multiply
    691.53x = 954.32 × 411.78
  4. Step 4: Simplify right side
    691.53x = 392,969.89
  5. Step 5: Solve for x
    x = 392,969.89/691.53
  6. Step 6: Final answer
    x = 568.26

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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.