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Finding the Fourth Proportional to 155.38, 231.92 and 143.18

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Solution

The fourth proportional to 155.38, 231.92 and 143.18 is: 213.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.38 : 231.92 = 143.18 : x
  2. Step 2: Convert to fraction form
    155.38/231.92 = 143.18/x
  3. Step 3: Cross multiply
    155.38x = 231.92 × 143.18
  4. Step 4: Simplify right side
    155.38x = 33,206.31
  5. Step 5: Solve for x
    x = 33,206.31/155.38
  6. Step 6: Final answer
    x = 213.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.