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Finding the Fourth Proportional to 91.28, 126 and 84.46

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Solution

The fourth proportional to 91.28, 126 and 84.46 is: 116.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.28 : 126 = 84.46 : x
  2. Step 2: Convert to fraction form
    91.28/126 = 84.46/x
  3. Step 3: Cross multiply
    91.28x = 126 × 84.46
  4. Step 4: Simplify right side
    91.28x = 10,641.96
  5. Step 5: Solve for x
    x = 10,641.96/91.28
  6. Step 6: Final answer
    x = 116.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.