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Finding the Fourth Proportional to 2,649.60, 3,951.36 and 2,620.80

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Solution

The fourth proportional to 2,649.60, 3,951.36 and 2,620.80 is: 3,908.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,649.60 : 3,951.36 = 2,620.80 : x
  2. Step 2: Convert to fraction form
    2,649.60/3,951.36 = 2,620.80/x
  3. Step 3: Cross multiply
    2,649.60x = 3,951.36 × 2,620.80
  4. Step 4: Simplify right side
    2,649.60x = 10,355,724.29
  5. Step 5: Solve for x
    x = 10,355,724.29/2,649.60
  6. Step 6: Final answer
    x = 3,908.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.