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Finding the Fourth Proportional to 2,190.80, 3,279.80 and 1,960.40

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Solution

The fourth proportional to 2,190.80, 3,279.80 and 1,960.40 is: 2,934.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,190.80 : 3,279.80 = 1,960.40 : x
  2. Step 2: Convert to fraction form
    2,190.80/3,279.80 = 1,960.40/x
  3. Step 3: Cross multiply
    2,190.80x = 3,279.80 × 1,960.40
  4. Step 4: Simplify right side
    2,190.80x = 6,429,719.92
  5. Step 5: Solve for x
    x = 6,429,719.92/2,190.80
  6. Step 6: Final answer
    x = 2,934.87

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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.