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Finding the Fourth Proportional to 186.80, 280.19 and 71.22

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Solution

The fourth proportional to 186.80, 280.19 and 71.22 is: 106.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.80 : 280.19 = 71.22 : x
  2. Step 2: Convert to fraction form
    186.80/280.19 = 71.22/x
  3. Step 3: Cross multiply
    186.80x = 280.19 × 71.22
  4. Step 4: Simplify right side
    186.80x = 19,954.78
  5. Step 5: Solve for x
    x = 19,954.78/186.80
  6. Step 6: Final answer
    x = 106.83

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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.