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Finding the Fourth Proportional to 99.18, 148.50 and 81.36

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Solution

The fourth proportional to 99.18, 148.50 and 81.36 is: 121.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.18 : 148.50 = 81.36 : x
  2. Step 2: Convert to fraction form
    99.18/148.50 = 81.36/x
  3. Step 3: Cross multiply
    99.18x = 148.50 × 81.36
  4. Step 4: Simplify right side
    99.18x = 12,081.96
  5. Step 5: Solve for x
    x = 12,081.96/99.18
  6. Step 6: Final answer
    x = 121.82

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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.