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Finding the Fourth Proportional to 1,372.11, 2,058.84 and 641.55

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Solution

The fourth proportional to 1,372.11, 2,058.84 and 641.55 is: 962.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.11 : 2,058.84 = 641.55 : x
  2. Step 2: Convert to fraction form
    1,372.11/2,058.84 = 641.55/x
  3. Step 3: Cross multiply
    1,372.11x = 2,058.84 × 641.55
  4. Step 4: Simplify right side
    1,372.11x = 1,320,848.80
  5. Step 5: Solve for x
    x = 1,320,848.80/1,372.11
  6. Step 6: Final answer
    x = 962.64

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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.