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Finding the Fourth Proportional to 99.44, 136.52 and 89.72

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Solution

The fourth proportional to 99.44, 136.52 and 89.72 is: 123.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.44 : 136.52 = 89.72 : x
  2. Step 2: Convert to fraction form
    99.44/136.52 = 89.72/x
  3. Step 3: Cross multiply
    99.44x = 136.52 × 89.72
  4. Step 4: Simplify right side
    99.44x = 12,248.57
  5. Step 5: Solve for x
    x = 12,248.57/99.44
  6. Step 6: Final answer
    x = 123.18

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.