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Finding the Fourth Proportional to 124.74, 186.80 and 81.27

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Solution

The fourth proportional to 124.74, 186.80 and 81.27 is: 121.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.74 : 186.80 = 81.27 : x
  2. Step 2: Convert to fraction form
    124.74/186.80 = 81.27/x
  3. Step 3: Cross multiply
    124.74x = 186.80 × 81.27
  4. Step 4: Simplify right side
    124.74x = 15,180.83
  5. Step 5: Solve for x
    x = 15,180.83/124.74
  6. Step 6: Final answer
    x = 121.70

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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.