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Finding the Fourth Proportional to 111.48, 167.15 and 77.25

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Solution

The fourth proportional to 111.48, 167.15 and 77.25 is: 115.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.48 : 167.15 = 77.25 : x
  2. Step 2: Convert to fraction form
    111.48/167.15 = 77.25/x
  3. Step 3: Cross multiply
    111.48x = 167.15 × 77.25
  4. Step 4: Simplify right side
    111.48x = 12,913.05
  5. Step 5: Solve for x
    x = 12,913.05/111.48
  6. Step 6: Final answer
    x = 115.84

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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.