Home / 1,811.68-2,717.20-512.80

Finding the Fourth Proportional to 1,811.68, 2,717.20 and 512.80

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Solution

The fourth proportional to 1,811.68, 2,717.20 and 512.80 is: 769.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.68 : 2,717.20 = 512.80 : x
  2. Step 2: Convert to fraction form
    1,811.68/2,717.20 = 512.80/x
  3. Step 3: Cross multiply
    1,811.68x = 2,717.20 × 512.80
  4. Step 4: Simplify right side
    1,811.68x = 1,393,380.16
  5. Step 5: Solve for x
    x = 1,393,380.16/1,811.68
  6. Step 6: Final answer
    x = 769.11

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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.