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Finding the Fourth Proportional to 258.48, 387.71 and 112.21

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Solution

The fourth proportional to 258.48, 387.71 and 112.21 is: 168.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.48 : 387.71 = 112.21 : x
  2. Step 2: Convert to fraction form
    258.48/387.71 = 112.21/x
  3. Step 3: Cross multiply
    258.48x = 387.71 × 112.21
  4. Step 4: Simplify right side
    258.48x = 43,503.83
  5. Step 5: Solve for x
    x = 43,503.83/258.48
  6. Step 6: Final answer
    x = 168.31

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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.