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Finding the Fourth Proportional to 136.53, 188.66 and 109.13

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Solution

The fourth proportional to 136.53, 188.66 and 109.13 is: 150.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.53 : 188.66 = 109.13 : x
  2. Step 2: Convert to fraction form
    136.53/188.66 = 109.13/x
  3. Step 3: Cross multiply
    136.53x = 188.66 × 109.13
  4. Step 4: Simplify right side
    136.53x = 20,587.89
  5. Step 5: Solve for x
    x = 20,587.89/136.53
  6. Step 6: Final answer
    x = 150.79

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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.