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Finding the Fourth Proportional to 124.50, 171.68 and 91.16

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Solution

The fourth proportional to 124.50, 171.68 and 91.16 is: 125.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.50 : 171.68 = 91.16 : x
  2. Step 2: Convert to fraction form
    124.50/171.68 = 91.16/x
  3. Step 3: Cross multiply
    124.50x = 171.68 × 91.16
  4. Step 4: Simplify right side
    124.50x = 15,649.03
  5. Step 5: Solve for x
    x = 15,649.03/124.50
  6. Step 6: Final answer
    x = 125.70

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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.