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Finding the Fourth Proportional to 110.99, 166.40 and 42.49

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Solution

The fourth proportional to 110.99, 166.40 and 42.49 is: 63.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.99 : 166.40 = 42.49 : x
  2. Step 2: Convert to fraction form
    110.99/166.40 = 42.49/x
  3. Step 3: Cross multiply
    110.99x = 166.40 × 42.49
  4. Step 4: Simplify right side
    110.99x = 7,070.73
  5. Step 5: Solve for x
    x = 7,070.73/110.99
  6. Step 6: Final answer
    x = 63.71

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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.