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Finding the Fourth Proportional to 1,253.31, 1,879.97 and 387.62

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Solution

The fourth proportional to 1,253.31, 1,879.97 and 387.62 is: 581.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.31 : 1,879.97 = 387.62 : x
  2. Step 2: Convert to fraction form
    1,253.31/1,879.97 = 387.62/x
  3. Step 3: Cross multiply
    1,253.31x = 1,879.97 × 387.62
  4. Step 4: Simplify right side
    1,253.31x = 728,702.63
  5. Step 5: Solve for x
    x = 728,702.63/1,253.31
  6. Step 6: Final answer
    x = 581.42

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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.