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Finding the Fourth Proportional to 124.26, 171.49 and 71.81

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Solution

The fourth proportional to 124.26, 171.49 and 71.81 is: 99.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.26 : 171.49 = 71.81 : x
  2. Step 2: Convert to fraction form
    124.26/171.49 = 71.81/x
  3. Step 3: Cross multiply
    124.26x = 171.49 × 71.81
  4. Step 4: Simplify right side
    124.26x = 12,314.70
  5. Step 5: Solve for x
    x = 12,314.70/124.26
  6. Step 6: Final answer
    x = 99.10

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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.