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Finding the Fourth Proportional to 99, 147.90 and 80.88

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Solution

The fourth proportional to 99, 147.90 and 80.88 is: 120.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    99 : 147.90 = 80.88 : x
  2. Step 2: Convert to fraction form
    99/147.90 = 80.88/x
  3. Step 3: Cross multiply
    99x = 147.90 × 80.88
  4. Step 4: Simplify right side
    99x = 11,962.15
  5. Step 5: Solve for x
    x = 11,962.15/99
  6. Step 6: Final answer
    x = 120.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.