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Finding the Fourth Proportional to 257.99, 387.33 and 219.72

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Solution

The fourth proportional to 257.99, 387.33 and 219.72 is: 329.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.99 : 387.33 = 219.72 : x
  2. Step 2: Convert to fraction form
    257.99/387.33 = 219.72/x
  3. Step 3: Cross multiply
    257.99x = 387.33 × 219.72
  4. Step 4: Simplify right side
    257.99x = 85,104.15
  5. Step 5: Solve for x
    x = 85,104.15/257.99
  6. Step 6: Final answer
    x = 329.87

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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.