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Finding the Fourth Proportional to 91.34, 136.78 and 72.04

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Solution

The fourth proportional to 91.34, 136.78 and 72.04 is: 107.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.34 : 136.78 = 72.04 : x
  2. Step 2: Convert to fraction form
    91.34/136.78 = 72.04/x
  3. Step 3: Cross multiply
    91.34x = 136.78 × 72.04
  4. Step 4: Simplify right side
    91.34x = 9,853.63
  5. Step 5: Solve for x
    x = 9,853.63/91.34
  6. Step 6: Final answer
    x = 107.88

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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.