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Finding the Fourth Proportional to 124.50, 186.68 and 81.16

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Solution

The fourth proportional to 124.50, 186.68 and 81.16 is: 121.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.50 : 186.68 = 81.16 : x
  2. Step 2: Convert to fraction form
    124.50/186.68 = 81.16/x
  3. Step 3: Cross multiply
    124.50x = 186.68 × 81.16
  4. Step 4: Simplify right side
    124.50x = 15,150.95
  5. Step 5: Solve for x
    x = 15,150.95/124.50
  6. Step 6: Final answer
    x = 121.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.