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Finding the Fourth Proportional to 2,187.82, 3,279.90 and 890.20

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Solution

The fourth proportional to 2,187.82, 3,279.90 and 890.20 is: 1,334.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.82 : 3,279.90 = 890.20 : x
  2. Step 2: Convert to fraction form
    2,187.82/3,279.90 = 890.20/x
  3. Step 3: Cross multiply
    2,187.82x = 3,279.90 × 890.20
  4. Step 4: Simplify right side
    2,187.82x = 2,919,766.98
  5. Step 5: Solve for x
    x = 2,919,766.98/2,187.82
  6. Step 6: Final answer
    x = 1,334.56

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1.5x scale

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.