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Finding the Fourth Proportional to 136.81, 205.32 and 100.75

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Solution

The fourth proportional to 136.81, 205.32 and 100.75 is: 151.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.81 : 205.32 = 100.75 : x
  2. Step 2: Convert to fraction form
    136.81/205.32 = 100.75/x
  3. Step 3: Cross multiply
    136.81x = 205.32 × 100.75
  4. Step 4: Simplify right side
    136.81x = 20,685.99
  5. Step 5: Solve for x
    x = 20,685.99/136.81
  6. Step 6: Final answer
    x = 151.20

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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.