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Finding the Fourth Proportional to 155.14, 213.61 and 131.78

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Solution

The fourth proportional to 155.14, 213.61 and 131.78 is: 181.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.14 : 213.61 = 131.78 : x
  2. Step 2: Convert to fraction form
    155.14/213.61 = 131.78/x
  3. Step 3: Cross multiply
    155.14x = 213.61 × 131.78
  4. Step 4: Simplify right side
    155.14x = 28,149.20
  5. Step 5: Solve for x
    x = 28,149.20/155.14
  6. Step 6: Final answer
    x = 181.44

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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.