Home / 3,998.30-5,518.38-2,320.78

Finding the Fourth Proportional to 3,998.30, 5,518.38 and 2,320.78

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Solution

The fourth proportional to 3,998.30, 5,518.38 and 2,320.78 is: 3,203.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,998.30 : 5,518.38 = 2,320.78 : x
  2. Step 2: Convert to fraction form
    3,998.30/5,518.38 = 2,320.78/x
  3. Step 3: Cross multiply
    3,998.30x = 5,518.38 × 2,320.78
  4. Step 4: Simplify right side
    3,998.30x = 12,806,945.94
  5. Step 5: Solve for x
    x = 12,806,945.94/3,998.30
  6. Step 6: Final answer
    x = 3,203.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.