Home / 2,187.30-3,278.85-725.70

Finding the Fourth Proportional to 2,187.30, 3,278.85 and 725.70

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Solution

The fourth proportional to 2,187.30, 3,278.85 and 725.70 is: 1,087.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.30 : 3,278.85 = 725.70 : x
  2. Step 2: Convert to fraction form
    2,187.30/3,278.85 = 725.70/x
  3. Step 3: Cross multiply
    2,187.30x = 3,278.85 × 725.70
  4. Step 4: Simplify right side
    2,187.30x = 2,379,461.45
  5. Step 5: Solve for x
    x = 2,379,461.45/2,187.30
  6. Step 6: Final answer
    x = 1,087.85

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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.