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Finding the Fourth Proportional to 379.72, 570.12 and 249.31

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Solution

The fourth proportional to 379.72, 570.12 and 249.31 is: 374.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.72 : 570.12 = 249.31 : x
  2. Step 2: Convert to fraction form
    379.72/570.12 = 249.31/x
  3. Step 3: Cross multiply
    379.72x = 570.12 × 249.31
  4. Step 4: Simplify right side
    379.72x = 142,136.62
  5. Step 5: Solve for x
    x = 142,136.62/379.72
  6. Step 6: Final answer
    x = 374.32

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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.