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Finding the Fourth Proportional to 136.62, 188.48 and 99.69

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Solution

The fourth proportional to 136.62, 188.48 and 99.69 is: 137.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.62 : 188.48 = 99.69 : x
  2. Step 2: Convert to fraction form
    136.62/188.48 = 99.69/x
  3. Step 3: Cross multiply
    136.62x = 188.48 × 99.69
  4. Step 4: Simplify right side
    136.62x = 18,789.07
  5. Step 5: Solve for x
    x = 18,789.07/136.62
  6. Step 6: Final answer
    x = 137.53

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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.