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Finding the Fourth Proportional to 91.86, 126.72 and 71.16

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Solution

The fourth proportional to 91.86, 126.72 and 71.16 is: 98.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.86 : 126.72 = 71.16 : x
  2. Step 2: Convert to fraction form
    91.86/126.72 = 71.16/x
  3. Step 3: Cross multiply
    91.86x = 126.72 × 71.16
  4. Step 4: Simplify right side
    91.86x = 9,017.40
  5. Step 5: Solve for x
    x = 9,017.40/91.86
  6. Step 6: Final answer
    x = 98.16

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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.