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Finding the Fourth Proportional to 124.50, 171.57 and 80.76

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Solution

The fourth proportional to 124.50, 171.57 and 80.76 is: 111.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.50 : 171.57 = 80.76 : x
  2. Step 2: Convert to fraction form
    124.50/171.57 = 80.76/x
  3. Step 3: Cross multiply
    124.50x = 171.57 × 80.76
  4. Step 4: Simplify right side
    124.50x = 13,855.99
  5. Step 5: Solve for x
    x = 13,855.99/124.50
  6. Step 6: Final answer
    x = 111.29

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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.