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Finding the Fourth Proportional to 186.96, 279.84 and 138.96

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Solution

The fourth proportional to 186.96, 279.84 and 138.96 is: 207.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.96 : 279.84 = 138.96 : x
  2. Step 2: Convert to fraction form
    186.96/279.84 = 138.96/x
  3. Step 3: Cross multiply
    186.96x = 279.84 × 138.96
  4. Step 4: Simplify right side
    186.96x = 38,886.57
  5. Step 5: Solve for x
    x = 38,886.57/186.96
  6. Step 6: Final answer
    x = 207.99

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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.