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Finding the Fourth Proportional to 111.42, 167.16 and 39.30

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Solution

The fourth proportional to 111.42, 167.16 and 39.30 is: 58.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.42 : 167.16 = 39.30 : x
  2. Step 2: Convert to fraction form
    111.42/167.16 = 39.30/x
  3. Step 3: Cross multiply
    111.42x = 167.16 × 39.30
  4. Step 4: Simplify right side
    111.42x = 6,569.39
  5. Step 5: Solve for x
    x = 6,569.39/111.42
  6. Step 6: Final answer
    x = 58.96

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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.