Home / 7,811.20-11,708.88-2,612.80

Finding the Fourth Proportional to 7,811.20, 11,708.88 and 2,612.80

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Solution

The fourth proportional to 7,811.20, 11,708.88 and 2,612.80 is: 3,916.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,811.20 : 11,708.88 = 2,612.80 : x
  2. Step 2: Convert to fraction form
    7,811.20/11,708.88 = 2,612.80/x
  3. Step 3: Cross multiply
    7,811.20x = 11,708.88 × 2,612.80
  4. Step 4: Simplify right side
    7,811.20x = 30,592,961.66
  5. Step 5: Solve for x
    x = 30,592,961.66/7,811.20
  6. Step 6: Final answer
    x = 3,916.55

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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.