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Finding the Fourth Proportional to 99.44, 148.80 and 86.74

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Solution

The fourth proportional to 99.44, 148.80 and 86.74 is: 129.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.44 : 148.80 = 86.74 : x
  2. Step 2: Convert to fraction form
    99.44/148.80 = 86.74/x
  3. Step 3: Cross multiply
    99.44x = 148.80 × 86.74
  4. Step 4: Simplify right side
    99.44x = 12,906.91
  5. Step 5: Solve for x
    x = 12,906.91/99.44
  6. Step 6: Final answer
    x = 129.80

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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.