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Finding the Fourth Proportional to 91.64, 137.82 and 90.84

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Solution

The fourth proportional to 91.64, 137.82 and 90.84 is: 136.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.64 : 137.82 = 90.84 : x
  2. Step 2: Convert to fraction form
    91.64/137.82 = 90.84/x
  3. Step 3: Cross multiply
    91.64x = 137.82 × 90.84
  4. Step 4: Simplify right side
    91.64x = 12,519.57
  5. Step 5: Solve for x
    x = 12,519.57/91.64
  6. Step 6: Final answer
    x = 136.62

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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.