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Finding the Fourth Proportional to 387.20, 579.54 and 248.47

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Solution

The fourth proportional to 387.20, 579.54 and 248.47 is: 371.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.20 : 579.54 = 248.47 : x
  2. Step 2: Convert to fraction form
    387.20/579.54 = 248.47/x
  3. Step 3: Cross multiply
    387.20x = 579.54 × 248.47
  4. Step 4: Simplify right side
    387.20x = 143,998.30
  5. Step 5: Solve for x
    x = 143,998.30/387.20
  6. Step 6: Final answer
    x = 371.90

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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.