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Finding the Fourth Proportional to 124.18, 186.20 and 66.43

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Solution

The fourth proportional to 124.18, 186.20 and 66.43 is: 99.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.18 : 186.20 = 66.43 : x
  2. Step 2: Convert to fraction form
    124.18/186.20 = 66.43/x
  3. Step 3: Cross multiply
    124.18x = 186.20 × 66.43
  4. Step 4: Simplify right side
    124.18x = 12,368.93
  5. Step 5: Solve for x
    x = 12,368.93/124.18
  6. Step 6: Final answer
    x = 99.60

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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.