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Finding the Fourth Proportional to 155.56, 214.31 and 108.85

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Solution

The fourth proportional to 155.56, 214.31 and 108.85 is: 149.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.56 : 214.31 = 108.85 : x
  2. Step 2: Convert to fraction form
    155.56/214.31 = 108.85/x
  3. Step 3: Cross multiply
    155.56x = 214.31 × 108.85
  4. Step 4: Simplify right side
    155.56x = 23,326.97
  5. Step 5: Solve for x
    x = 23,326.97/155.56
  6. Step 6: Final answer
    x = 149.96

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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.