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Finding the Fourth Proportional to 91.28, 135.89 and 90.82

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Solution

The fourth proportional to 91.28, 135.89 and 90.82 is: 135.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.28 : 135.89 = 90.82 : x
  2. Step 2: Convert to fraction form
    91.28/135.89 = 90.82/x
  3. Step 3: Cross multiply
    91.28x = 135.89 × 90.82
  4. Step 4: Simplify right side
    91.28x = 12,341.71
  5. Step 5: Solve for x
    x = 12,341.71/91.28
  6. Step 6: Final answer
    x = 135.21

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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.