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Finding the Fourth Proportional to 91.89, 126.81 and 72.25

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Solution

The fourth proportional to 91.89, 126.81 and 72.25 is: 99.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.89 : 126.81 = 72.25 : x
  2. Step 2: Convert to fraction form
    91.89/126.81 = 72.25/x
  3. Step 3: Cross multiply
    91.89x = 126.81 × 72.25
  4. Step 4: Simplify right side
    91.89x = 9,161.39
  5. Step 5: Solve for x
    x = 9,161.39/91.89
  6. Step 6: Final answer
    x = 99.70

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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.