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Finding the Fourth Proportional to 186.82, 280.25 and 78.58

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Solution

The fourth proportional to 186.82, 280.25 and 78.58 is: 117.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.82 : 280.25 = 78.58 : x
  2. Step 2: Convert to fraction form
    186.82/280.25 = 78.58/x
  3. Step 3: Cross multiply
    186.82x = 280.25 × 78.58
  4. Step 4: Simplify right side
    186.82x = 22,022.05
  5. Step 5: Solve for x
    x = 22,022.05/186.82
  6. Step 6: Final answer
    x = 117.88

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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.