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Finding the Fourth Proportional to 91.27, 136.80 and 55.22

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Solution

The fourth proportional to 91.27, 136.80 and 55.22 is: 82.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.27 : 136.80 = 55.22 : x
  2. Step 2: Convert to fraction form
    91.27/136.80 = 55.22/x
  3. Step 3: Cross multiply
    91.27x = 136.80 × 55.22
  4. Step 4: Simplify right side
    91.27x = 7,554.44
  5. Step 5: Solve for x
    x = 7,554.44/91.27
  6. Step 6: Final answer
    x = 82.77

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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.