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Finding the Fourth Proportional to 186.85, 257.78 and 124.62

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Solution

The fourth proportional to 186.85, 257.78 and 124.62 is: 171.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.85 : 257.78 = 124.62 : x
  2. Step 2: Convert to fraction form
    186.85/257.78 = 124.62/x
  3. Step 3: Cross multiply
    186.85x = 257.78 × 124.62
  4. Step 4: Simplify right side
    186.85x = 32,123.89
  5. Step 5: Solve for x
    x = 32,123.89/186.85
  6. Step 6: Final answer
    x = 171.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.