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Finding the Fourth Proportional to 99.33, 136.80 and 89.01

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Solution

The fourth proportional to 99.33, 136.80 and 89.01 is: 122.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.33 : 136.80 = 89.01 : x
  2. Step 2: Convert to fraction form
    99.33/136.80 = 89.01/x
  3. Step 3: Cross multiply
    99.33x = 136.80 × 89.01
  4. Step 4: Simplify right side
    99.33x = 12,176.57
  5. Step 5: Solve for x
    x = 12,176.57/99.33
  6. Step 6: Final answer
    x = 122.59

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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.