Home / 2,186.12-3,278.10-724.78

Finding the Fourth Proportional to 2,186.12, 3,278.10 and 724.78

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Solution

The fourth proportional to 2,186.12, 3,278.10 and 724.78 is: 1,086.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,186.12 : 3,278.10 = 724.78 : x
  2. Step 2: Convert to fraction form
    2,186.12/3,278.10 = 724.78/x
  3. Step 3: Cross multiply
    2,186.12x = 3,278.10 × 724.78
  4. Step 4: Simplify right side
    2,186.12x = 2,375,908.13
  5. Step 5: Solve for x
    x = 2,375,908.13/2,186.12
  6. Step 6: Final answer
    x = 1,086.81

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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.