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Finding the Fourth Proportional to 104.32, 143.89 and 76.69

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Solution

The fourth proportional to 104.32, 143.89 and 76.69 is: 105.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.32 : 143.89 = 76.69 : x
  2. Step 2: Convert to fraction form
    104.32/143.89 = 76.69/x
  3. Step 3: Cross multiply
    104.32x = 143.89 × 76.69
  4. Step 4: Simplify right side
    104.32x = 11,034.92
  5. Step 5: Solve for x
    x = 11,034.92/104.32
  6. Step 6: Final answer
    x = 105.78

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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.