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Finding the Fourth Proportional to 124.55, 171.91 and 80.81

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Solution

The fourth proportional to 124.55, 171.91 and 80.81 is: 111.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.55 : 171.91 = 80.81 : x
  2. Step 2: Convert to fraction form
    124.55/171.91 = 80.81/x
  3. Step 3: Cross multiply
    124.55x = 171.91 × 80.81
  4. Step 4: Simplify right side
    124.55x = 13,891.93
  5. Step 5: Solve for x
    x = 13,891.93/124.55
  6. Step 6: Final answer
    x = 111.54

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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.