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Finding the Fourth Proportional to 91.19, 136.53 and 85.52

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Solution

The fourth proportional to 91.19, 136.53 and 85.52 is: 128.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.19 : 136.53 = 85.52 : x
  2. Step 2: Convert to fraction form
    91.19/136.53 = 85.52/x
  3. Step 3: Cross multiply
    91.19x = 136.53 × 85.52
  4. Step 4: Simplify right side
    91.19x = 11,676.05
  5. Step 5: Solve for x
    x = 11,676.05/91.19
  6. Step 6: Final answer
    x = 128.04

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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.