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Finding the Fourth Proportional to 124.12, 185.80 and 80.69

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Solution

The fourth proportional to 124.12, 185.80 and 80.69 is: 120.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.12 : 185.80 = 80.69 : x
  2. Step 2: Convert to fraction form
    124.12/185.80 = 80.69/x
  3. Step 3: Cross multiply
    124.12x = 185.80 × 80.69
  4. Step 4: Simplify right side
    124.12x = 14,992.78
  5. Step 5: Solve for x
    x = 14,992.78/124.12
  6. Step 6: Final answer
    x = 120.79

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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.