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Finding the Fourth Proportional to 111.98, 167.80 and 51.09

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Solution

The fourth proportional to 111.98, 167.80 and 51.09 is: 76.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.98 : 167.80 = 51.09 : x
  2. Step 2: Convert to fraction form
    111.98/167.80 = 51.09/x
  3. Step 3: Cross multiply
    111.98x = 167.80 × 51.09
  4. Step 4: Simplify right side
    111.98x = 8,572.90
  5. Step 5: Solve for x
    x = 8,572.90/111.98
  6. Step 6: Final answer
    x = 76.56

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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.