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Finding the Fourth Proportional to 104.92, 144.90 and 86.68

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Solution

The fourth proportional to 104.92, 144.90 and 86.68 is: 119.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.92 : 144.90 = 86.68 : x
  2. Step 2: Convert to fraction form
    104.92/144.90 = 86.68/x
  3. Step 3: Cross multiply
    104.92x = 144.90 × 86.68
  4. Step 4: Simplify right side
    104.92x = 12,559.93
  5. Step 5: Solve for x
    x = 12,559.93/104.92
  6. Step 6: Final answer
    x = 119.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.