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Finding the Fourth Proportional to 99.59, 149.46 and 76.90

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Solution

The fourth proportional to 99.59, 149.46 and 76.90 is: 115.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.59 : 149.46 = 76.90 : x
  2. Step 2: Convert to fraction form
    99.59/149.46 = 76.90/x
  3. Step 3: Cross multiply
    99.59x = 149.46 × 76.90
  4. Step 4: Simplify right side
    99.59x = 11,493.39
  5. Step 5: Solve for x
    x = 11,493.39/99.59
  6. Step 6: Final answer
    x = 115.41

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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.