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Finding the Fourth Proportional to 91.52, 126.34 and 72.18

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Solution

The fourth proportional to 91.52, 126.34 and 72.18 is: 99.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.52 : 126.34 = 72.18 : x
  2. Step 2: Convert to fraction form
    91.52/126.34 = 72.18/x
  3. Step 3: Cross multiply
    91.52x = 126.34 × 72.18
  4. Step 4: Simplify right side
    91.52x = 9,119.22
  5. Step 5: Solve for x
    x = 9,119.22/91.52
  6. Step 6: Final answer
    x = 99.64

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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.