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Finding the Fourth Proportional to 379.60, 569.31 and 257.83

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Solution

The fourth proportional to 379.60, 569.31 and 257.83 is: 386.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.60 : 569.31 = 257.83 : x
  2. Step 2: Convert to fraction form
    379.60/569.31 = 257.83/x
  3. Step 3: Cross multiply
    379.60x = 569.31 × 257.83
  4. Step 4: Simplify right side
    379.60x = 146,785.20
  5. Step 5: Solve for x
    x = 146,785.20/379.60
  6. Step 6: Final answer
    x = 386.68

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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.