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Finding the Fourth Proportional to 167.12, 230.64 and 100.75

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Solution

The fourth proportional to 167.12, 230.64 and 100.75 is: 139.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.12 : 230.64 = 100.75 : x
  2. Step 2: Convert to fraction form
    167.12/230.64 = 100.75/x
  3. Step 3: Cross multiply
    167.12x = 230.64 × 100.75
  4. Step 4: Simplify right side
    167.12x = 23,236.98
  5. Step 5: Solve for x
    x = 23,236.98/167.12
  6. Step 6: Final answer
    x = 139.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.