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Finding the Fourth Proportional to 111.63, 167.40 and 57.42

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Solution

The fourth proportional to 111.63, 167.40 and 57.42 is: 86.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.63 : 167.40 = 57.42 : x
  2. Step 2: Convert to fraction form
    111.63/167.40 = 57.42/x
  3. Step 3: Cross multiply
    111.63x = 167.40 × 57.42
  4. Step 4: Simplify right side
    111.63x = 9,612.11
  5. Step 5: Solve for x
    x = 9,612.11/111.63
  6. Step 6: Final answer
    x = 86.11

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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.