Home / 2,131.20-3,196.80-1,310.40

Finding the Fourth Proportional to 2,131.20, 3,196.80 and 1,310.40

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Solution

The fourth proportional to 2,131.20, 3,196.80 and 1,310.40 is: 1,965.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,131.20 : 3,196.80 = 1,310.40 : x
  2. Step 2: Convert to fraction form
    2,131.20/3,196.80 = 1,310.40/x
  3. Step 3: Cross multiply
    2,131.20x = 3,196.80 × 1,310.40
  4. Step 4: Simplify right side
    2,131.20x = 4,189,086.72
  5. Step 5: Solve for x
    x = 4,189,086.72/2,131.20
  6. Step 6: Final answer
    x = 1,965.60

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Similar ratio
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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.