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Finding the Fourth Proportional to 91.71, 126.46 and 72

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Solution

The fourth proportional to 91.71, 126.46 and 72 is: 99.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.71 : 126.46 = 72 : x
  2. Step 2: Convert to fraction form
    91.71/126.46 = 72/x
  3. Step 3: Cross multiply
    91.71x = 126.46 × 72
  4. Step 4: Simplify right side
    91.71x = 9,105.12
  5. Step 5: Solve for x
    x = 9,105.12/91.71
  6. Step 6: Final answer
    x = 99.28

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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.