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Finding the Fourth Proportional to 91.85, 126.69 and 84.50

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Solution

The fourth proportional to 91.85, 126.69 and 84.50 is: 116.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.85 : 126.69 = 84.50 : x
  2. Step 2: Convert to fraction form
    91.85/126.69 = 84.50/x
  3. Step 3: Cross multiply
    91.85x = 126.69 × 84.50
  4. Step 4: Simplify right side
    91.85x = 10,705.31
  5. Step 5: Solve for x
    x = 10,705.31/91.85
  6. Step 6: Final answer
    x = 116.55

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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.