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Finding the Fourth Proportional to 187.15, 280.82 and 141.78

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Solution

The fourth proportional to 187.15, 280.82 and 141.78 is: 212.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.15 : 280.82 = 141.78 : x
  2. Step 2: Convert to fraction form
    187.15/280.82 = 141.78/x
  3. Step 3: Cross multiply
    187.15x = 280.82 × 141.78
  4. Step 4: Simplify right side
    187.15x = 39,814.66
  5. Step 5: Solve for x
    x = 39,814.66/187.15
  6. Step 6: Final answer
    x = 212.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.