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Finding the Fourth Proportional to 258.74, 387.78 and 136.92

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Solution

The fourth proportional to 258.74, 387.78 and 136.92 is: 205.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.74 : 387.78 = 136.92 : x
  2. Step 2: Convert to fraction form
    258.74/387.78 = 136.92/x
  3. Step 3: Cross multiply
    258.74x = 387.78 × 136.92
  4. Step 4: Simplify right side
    258.74x = 53,094.84
  5. Step 5: Solve for x
    x = 53,094.84/258.74
  6. Step 6: Final answer
    x = 205.21

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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.