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Finding the Fourth Proportional to 71.99, 108 and 30.85

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Solution

The fourth proportional to 71.99, 108 and 30.85 is: 46.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.99 : 108 = 30.85 : x
  2. Step 2: Convert to fraction form
    71.99/108 = 30.85/x
  3. Step 3: Cross multiply
    71.99x = 108 × 30.85
  4. Step 4: Simplify right side
    71.99x = 3,331.53
  5. Step 5: Solve for x
    x = 3,331.53/71.99
  6. Step 6: Final answer
    x = 46.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.