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Finding the Fourth Proportional to 91.94, 126.85 and 71.18

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Solution

The fourth proportional to 91.94, 126.85 and 71.18 is: 98.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.94 : 126.85 = 71.18 : x
  2. Step 2: Convert to fraction form
    91.94/126.85 = 71.18/x
  3. Step 3: Cross multiply
    91.94x = 126.85 × 71.18
  4. Step 4: Simplify right side
    91.94x = 9,029.18
  5. Step 5: Solve for x
    x = 9,029.18/91.94
  6. Step 6: Final answer
    x = 98.21

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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.