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Finding the Fourth Proportional to 186.78, 279.96 and 159.78

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Solution

The fourth proportional to 186.78, 279.96 and 159.78 is: 239.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.78 : 279.96 = 159.78 : x
  2. Step 2: Convert to fraction form
    186.78/279.96 = 159.78/x
  3. Step 3: Cross multiply
    186.78x = 279.96 × 159.78
  4. Step 4: Simplify right side
    186.78x = 44,732.01
  5. Step 5: Solve for x
    x = 44,732.01/186.78
  6. Step 6: Final answer
    x = 239.49

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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.