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Finding the Fourth Proportional to 72.17, 108.80 and 67.76

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Solution

The fourth proportional to 72.17, 108.80 and 67.76 is: 102.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.17 : 108.80 = 67.76 : x
  2. Step 2: Convert to fraction form
    72.17/108.80 = 67.76/x
  3. Step 3: Cross multiply
    72.17x = 108.80 × 67.76
  4. Step 4: Simplify right side
    72.17x = 7,371.91
  5. Step 5: Solve for x
    x = 7,371.91/72.17
  6. Step 6: Final answer
    x = 102.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.