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Finding the Fourth Proportional to 461.31, 691.86 and 168.80

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Solution

The fourth proportional to 461.31, 691.86 and 168.80 is: 253.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.31 : 691.86 = 168.80 : x
  2. Step 2: Convert to fraction form
    461.31/691.86 = 168.80/x
  3. Step 3: Cross multiply
    461.31x = 691.86 × 168.80
  4. Step 4: Simplify right side
    461.31x = 116,785.97
  5. Step 5: Solve for x
    x = 116,785.97/461.31
  6. Step 6: Final answer
    x = 253.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.