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Finding the Fourth Proportional to 2,630.60, 3,945.90 and 2,169.80

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Solution

The fourth proportional to 2,630.60, 3,945.90 and 2,169.80 is: 3,254.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,630.60 : 3,945.90 = 2,169.80 : x
  2. Step 2: Convert to fraction form
    2,630.60/3,945.90 = 2,169.80/x
  3. Step 3: Cross multiply
    2,630.60x = 3,945.90 × 2,169.80
  4. Step 4: Simplify right side
    2,630.60x = 8,561,813.82
  5. Step 5: Solve for x
    x = 8,561,813.82/2,630.60
  6. Step 6: Final answer
    x = 3,254.70

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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.