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Finding the Fourth Proportional to 111.63, 167.49 and 53.88

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Solution

The fourth proportional to 111.63, 167.49 and 53.88 is: 80.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.63 : 167.49 = 53.88 : x
  2. Step 2: Convert to fraction form
    111.63/167.49 = 53.88/x
  3. Step 3: Cross multiply
    111.63x = 167.49 × 53.88
  4. Step 4: Simplify right side
    111.63x = 9,024.36
  5. Step 5: Solve for x
    x = 9,024.36/111.63
  6. Step 6: Final answer
    x = 80.84

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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.