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Finding the Fourth Proportional to 72.62, 108.17 and 68.77

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Solution

The fourth proportional to 72.62, 108.17 and 68.77 is: 102.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.62 : 108.17 = 68.77 : x
  2. Step 2: Convert to fraction form
    72.62/108.17 = 68.77/x
  3. Step 3: Cross multiply
    72.62x = 108.17 × 68.77
  4. Step 4: Simplify right side
    72.62x = 7,438.85
  5. Step 5: Solve for x
    x = 7,438.85/72.62
  6. Step 6: Final answer
    x = 102.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.