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Finding the Fourth Proportional to 1,372.44, 2,058 and 641.40

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Solution

The fourth proportional to 1,372.44, 2,058 and 641.40 is: 961.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.44 : 2,058 = 641.40 : x
  2. Step 2: Convert to fraction form
    1,372.44/2,058 = 641.40/x
  3. Step 3: Cross multiply
    1,372.44x = 2,058 × 641.40
  4. Step 4: Simplify right side
    1,372.44x = 1,320,001.20
  5. Step 5: Solve for x
    x = 1,320,001.20/1,372.44
  6. Step 6: Final answer
    x = 961.79

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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.