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Finding the Fourth Proportional to 379.32, 568.50 and 257.28

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Solution

The fourth proportional to 379.32, 568.50 and 257.28 is: 385.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.32 : 568.50 = 257.28 : x
  2. Step 2: Convert to fraction form
    379.32/568.50 = 257.28/x
  3. Step 3: Cross multiply
    379.32x = 568.50 × 257.28
  4. Step 4: Simplify right side
    379.32x = 146,263.68
  5. Step 5: Solve for x
    x = 146,263.68/379.32
  6. Step 6: Final answer
    x = 385.59

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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.