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Finding the Fourth Proportional to 167.30, 230.90 and 105.15

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Solution

The fourth proportional to 167.30, 230.90 and 105.15 is: 145.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.30 : 230.90 = 105.15 : x
  2. Step 2: Convert to fraction form
    167.30/230.90 = 105.15/x
  3. Step 3: Cross multiply
    167.30x = 230.90 × 105.15
  4. Step 4: Simplify right side
    167.30x = 24,279.14
  5. Step 5: Solve for x
    x = 24,279.14/167.30
  6. Step 6: Final answer
    x = 145.12

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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.