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Finding the Fourth Proportional to 136.88, 205.40 and 72.76

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Solution

The fourth proportional to 136.88, 205.40 and 72.76 is: 109.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.88 : 205.40 = 72.76 : x
  2. Step 2: Convert to fraction form
    136.88/205.40 = 72.76/x
  3. Step 3: Cross multiply
    136.88x = 205.40 × 72.76
  4. Step 4: Simplify right side
    136.88x = 14,944.90
  5. Step 5: Solve for x
    x = 14,944.90/136.88
  6. Step 6: Final answer
    x = 109.18

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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.