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Finding the Fourth Proportional to 124.49, 171.56 and 91.68

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Solution

The fourth proportional to 124.49, 171.56 and 91.68 is: 126.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.49 : 171.56 = 91.68 : x
  2. Step 2: Convert to fraction form
    124.49/171.56 = 91.68/x
  3. Step 3: Cross multiply
    124.49x = 171.56 × 91.68
  4. Step 4: Simplify right side
    124.49x = 15,728.16
  5. Step 5: Solve for x
    x = 15,728.16/124.49
  6. Step 6: Final answer
    x = 126.35

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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.