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Finding the Fourth Proportional to 186.38, 279.68 and 78.14

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Solution

The fourth proportional to 186.38, 279.68 and 78.14 is: 117.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.38 : 279.68 = 78.14 : x
  2. Step 2: Convert to fraction form
    186.38/279.68 = 78.14/x
  3. Step 3: Cross multiply
    186.38x = 279.68 × 78.14
  4. Step 4: Simplify right side
    186.38x = 21,854.20
  5. Step 5: Solve for x
    x = 21,854.20/186.38
  6. Step 6: Final answer
    x = 117.26

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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.