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Finding the Fourth Proportional to 111.95, 167.90 and 30.79

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Solution

The fourth proportional to 111.95, 167.90 and 30.79 is: 46.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.95 : 167.90 = 30.79 : x
  2. Step 2: Convert to fraction form
    111.95/167.90 = 30.79/x
  3. Step 3: Cross multiply
    111.95x = 167.90 × 30.79
  4. Step 4: Simplify right side
    111.95x = 5,169.30
  5. Step 5: Solve for x
    x = 5,169.30/111.95
  6. Step 6: Final answer
    x = 46.17

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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.