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Finding the Fourth Proportional to 79.05, 108.90 and 59.61

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Solution

The fourth proportional to 79.05, 108.90 and 59.61 is: 82.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.05 : 108.90 = 59.61 : x
  2. Step 2: Convert to fraction form
    79.05/108.90 = 59.61/x
  3. Step 3: Cross multiply
    79.05x = 108.90 × 59.61
  4. Step 4: Simplify right side
    79.05x = 6,491.53
  5. Step 5: Solve for x
    x = 6,491.53/79.05
  6. Step 6: Final answer
    x = 82.12

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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.