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Finding the Fourth Proportional to 379.95, 568.49 and 257.61

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Solution

The fourth proportional to 379.95, 568.49 and 257.61 is: 385.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.95 : 568.49 = 257.61 : x
  2. Step 2: Convert to fraction form
    379.95/568.49 = 257.61/x
  3. Step 3: Cross multiply
    379.95x = 568.49 × 257.61
  4. Step 4: Simplify right side
    379.95x = 146,447.42
  5. Step 5: Solve for x
    x = 146,447.42/379.95
  6. Step 6: Final answer
    x = 385.44

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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.