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Finding the Fourth Proportional to 136.68, 205.18 and 75.88

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Solution

The fourth proportional to 136.68, 205.18 and 75.88 is: 113.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.68 : 205.18 = 75.88 : x
  2. Step 2: Convert to fraction form
    136.68/205.18 = 75.88/x
  3. Step 3: Cross multiply
    136.68x = 205.18 × 75.88
  4. Step 4: Simplify right side
    136.68x = 15,569.06
  5. Step 5: Solve for x
    x = 15,569.06/136.68
  6. Step 6: Final answer
    x = 113.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.