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Finding the Fourth Proportional to 379.79, 568.77 and 257.68

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Solution

The fourth proportional to 379.79, 568.77 and 257.68 is: 385.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.79 : 568.77 = 257.68 : x
  2. Step 2: Convert to fraction form
    379.79/568.77 = 257.68/x
  3. Step 3: Cross multiply
    379.79x = 568.77 × 257.68
  4. Step 4: Simplify right side
    379.79x = 146,560.65
  5. Step 5: Solve for x
    x = 146,560.65/379.79
  6. Step 6: Final answer
    x = 385.90

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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.