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Finding the Fourth Proportional to 2,189.48, 3,279.90 and 1,325.48

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Solution

The fourth proportional to 2,189.48, 3,279.90 and 1,325.48 is: 1,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.48 : 3,279.90 = 1,325.48 : x
  2. Step 2: Convert to fraction form
    2,189.48/3,279.90 = 1,325.48/x
  3. Step 3: Cross multiply
    2,189.48x = 3,279.90 × 1,325.48
  4. Step 4: Simplify right side
    2,189.48x = 4,347,441.85
  5. Step 5: Solve for x
    x = 4,347,441.85/2,189.48
  6. Step 6: Final answer
    x = 1,985.60

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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.