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Finding the Fourth Proportional to 258.68, 388.61 and 167.55

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Solution

The fourth proportional to 258.68, 388.61 and 167.55 is: 251.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.68 : 388.61 = 167.55 : x
  2. Step 2: Convert to fraction form
    258.68/388.61 = 167.55/x
  3. Step 3: Cross multiply
    258.68x = 388.61 × 167.55
  4. Step 4: Simplify right side
    258.68x = 65,110.77
  5. Step 5: Solve for x
    x = 65,110.77/258.68
  6. Step 6: Final answer
    x = 251.71

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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.