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Finding the Fourth Proportional to 186.74, 257.42 and 124.54

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Solution

The fourth proportional to 186.74, 257.42 and 124.54 is: 171.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.74 : 257.42 = 124.54 : x
  2. Step 2: Convert to fraction form
    186.74/257.42 = 124.54/x
  3. Step 3: Cross multiply
    186.74x = 257.42 × 124.54
  4. Step 4: Simplify right side
    186.74x = 32,059.09
  5. Step 5: Solve for x
    x = 32,059.09/186.74
  6. Step 6: Final answer
    x = 171.68

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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.