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Finding the Fourth Proportional to 99.40, 149.02 and 77.96

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Solution

The fourth proportional to 99.40, 149.02 and 77.96 is: 116.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.40 : 149.02 = 77.96 : x
  2. Step 2: Convert to fraction form
    99.40/149.02 = 77.96/x
  3. Step 3: Cross multiply
    99.40x = 149.02 × 77.96
  4. Step 4: Simplify right side
    99.40x = 11,617.60
  5. Step 5: Solve for x
    x = 11,617.60/99.40
  6. Step 6: Final answer
    x = 116.88

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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.