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Finding the Fourth Proportional to 99.04, 136.39 and 81.62

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Solution

The fourth proportional to 99.04, 136.39 and 81.62 is: 112.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.04 : 136.39 = 81.62 : x
  2. Step 2: Convert to fraction form
    99.04/136.39 = 81.62/x
  3. Step 3: Cross multiply
    99.04x = 136.39 × 81.62
  4. Step 4: Simplify right side
    99.04x = 11,132.15
  5. Step 5: Solve for x
    x = 11,132.15/99.04
  6. Step 6: Final answer
    x = 112.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.