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Finding the Fourth Proportional to 258.74, 387.89 and 114.56

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Solution

The fourth proportional to 258.74, 387.89 and 114.56 is: 171.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.74 : 387.89 = 114.56 : x
  2. Step 2: Convert to fraction form
    258.74/387.89 = 114.56/x
  3. Step 3: Cross multiply
    258.74x = 387.89 × 114.56
  4. Step 4: Simplify right side
    258.74x = 44,436.68
  5. Step 5: Solve for x
    x = 44,436.68/258.74
  6. Step 6: Final answer
    x = 171.74

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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.