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Finding the Fourth Proportional to 124.56, 185.76 and 108.40

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Solution

The fourth proportional to 124.56, 185.76 and 108.40 is: 161.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.56 : 185.76 = 108.40 : x
  2. Step 2: Convert to fraction form
    124.56/185.76 = 108.40/x
  3. Step 3: Cross multiply
    124.56x = 185.76 × 108.40
  4. Step 4: Simplify right side
    124.56x = 20,136.38
  5. Step 5: Solve for x
    x = 20,136.38/124.56
  6. Step 6: Final answer
    x = 161.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.