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Finding the Fourth Proportional to 258.24, 387.36 and 113.92

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Solution

The fourth proportional to 258.24, 387.36 and 113.92 is: 170.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.24 : 387.36 = 113.92 : x
  2. Step 2: Convert to fraction form
    258.24/387.36 = 113.92/x
  3. Step 3: Cross multiply
    258.24x = 387.36 × 113.92
  4. Step 4: Simplify right side
    258.24x = 44,128.05
  5. Step 5: Solve for x
    x = 44,128.05/258.24
  6. Step 6: Final answer
    x = 170.88

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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.