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Finding the Fourth Proportional to 91.55, 136.11 and 90.63

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Solution

The fourth proportional to 91.55, 136.11 and 90.63 is: 134.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.55 : 136.11 = 90.63 : x
  2. Step 2: Convert to fraction form
    91.55/136.11 = 90.63/x
  3. Step 3: Cross multiply
    91.55x = 136.11 × 90.63
  4. Step 4: Simplify right side
    91.55x = 12,335.65
  5. Step 5: Solve for x
    x = 12,335.65/91.55
  6. Step 6: Final answer
    x = 134.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.