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Finding the Fourth Proportional to 259, 388.85 and 220.72

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Solution

The fourth proportional to 259, 388.85 and 220.72 is: 331.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    259 : 388.85 = 220.72 : x
  2. Step 2: Convert to fraction form
    259/388.85 = 220.72/x
  3. Step 3: Cross multiply
    259x = 388.85 × 220.72
  4. Step 4: Simplify right side
    259x = 85,826.97
  5. Step 5: Solve for x
    x = 85,826.97/259
  6. Step 6: Final answer
    x = 331.38

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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.