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Finding the Fourth Proportional to 99.19, 136.75 and 69.65

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Solution

The fourth proportional to 99.19, 136.75 and 69.65 is: 96.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.19 : 136.75 = 69.65 : x
  2. Step 2: Convert to fraction form
    99.19/136.75 = 69.65/x
  3. Step 3: Cross multiply
    99.19x = 136.75 × 69.65
  4. Step 4: Simplify right side
    99.19x = 9,524.47
  5. Step 5: Solve for x
    x = 9,524.47/99.19
  6. Step 6: Final answer
    x = 96.02

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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.