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Finding the Fourth Proportional to 91.91, 126.84 and 72.47

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Solution

The fourth proportional to 91.91, 126.84 and 72.47 is: 100.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.91 : 126.84 = 72.47 : x
  2. Step 2: Convert to fraction form
    91.91/126.84 = 72.47/x
  3. Step 3: Cross multiply
    91.91x = 126.84 × 72.47
  4. Step 4: Simplify right side
    91.91x = 9,192.09
  5. Step 5: Solve for x
    x = 9,192.09/91.91
  6. Step 6: Final answer
    x = 100.01

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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.