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Finding the Fourth Proportional to 272.54, 408.70 and 258.87

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Solution

The fourth proportional to 272.54, 408.70 and 258.87 is: 388.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.54 : 408.70 = 258.87 : x
  2. Step 2: Convert to fraction form
    272.54/408.70 = 258.87/x
  3. Step 3: Cross multiply
    272.54x = 408.70 × 258.87
  4. Step 4: Simplify right side
    272.54x = 105,799.42
  5. Step 5: Solve for x
    x = 105,799.42/272.54
  6. Step 6: Final answer
    x = 388.20

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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.