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Finding the Fourth Proportional to 186.78, 280.20 and 113.70

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Solution

The fourth proportional to 186.78, 280.20 and 113.70 is: 170.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.78 : 280.20 = 113.70 : x
  2. Step 2: Convert to fraction form
    186.78/280.20 = 113.70/x
  3. Step 3: Cross multiply
    186.78x = 280.20 × 113.70
  4. Step 4: Simplify right side
    186.78x = 31,858.74
  5. Step 5: Solve for x
    x = 31,858.74/186.78
  6. Step 6: Final answer
    x = 170.57

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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.