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Finding the Fourth Proportional to 1,371.65, 2,058.13 and 641.12

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Solution

The fourth proportional to 1,371.65, 2,058.13 and 641.12 is: 961.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.65 : 2,058.13 = 641.12 : x
  2. Step 2: Convert to fraction form
    1,371.65/2,058.13 = 641.12/x
  3. Step 3: Cross multiply
    1,371.65x = 2,058.13 × 641.12
  4. Step 4: Simplify right side
    1,371.65x = 1,319,508.31
  5. Step 5: Solve for x
    x = 1,319,508.31/1,371.65
  6. Step 6: Final answer
    x = 961.99

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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.