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Finding the Fourth Proportional to 186.38, 278.54 and 171.79

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Solution

The fourth proportional to 186.38, 278.54 and 171.79 is: 256.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.38 : 278.54 = 171.79 : x
  2. Step 2: Convert to fraction form
    186.38/278.54 = 171.79/x
  3. Step 3: Cross multiply
    186.38x = 278.54 × 171.79
  4. Step 4: Simplify right side
    186.38x = 47,850.39
  5. Step 5: Solve for x
    x = 47,850.39/186.38
  6. Step 6: Final answer
    x = 256.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.