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Finding the Fourth Proportional to 124.66, 186.71 and 66.78

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Solution

The fourth proportional to 124.66, 186.71 and 66.78 is: 100.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.66 : 186.71 = 66.78 : x
  2. Step 2: Convert to fraction form
    124.66/186.71 = 66.78/x
  3. Step 3: Cross multiply
    124.66x = 186.71 × 66.78
  4. Step 4: Simplify right side
    124.66x = 12,468.49
  5. Step 5: Solve for x
    x = 12,468.49/124.66
  6. Step 6: Final answer
    x = 100.02

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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.