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Finding the Fourth Proportional to 124.43, 186.21 and 78.80

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Solution

The fourth proportional to 124.43, 186.21 and 78.80 is: 117.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.43 : 186.21 = 78.80 : x
  2. Step 2: Convert to fraction form
    124.43/186.21 = 78.80/x
  3. Step 3: Cross multiply
    124.43x = 186.21 × 78.80
  4. Step 4: Simplify right side
    124.43x = 14,672.42
  5. Step 5: Solve for x
    x = 14,672.42/124.43
  6. Step 6: Final answer
    x = 117.92

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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.