Home / 3,912.80-5,398.74-2,420.78

Finding the Fourth Proportional to 3,912.80, 5,398.74 and 2,420.78

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Solution

The fourth proportional to 3,912.80, 5,398.74 and 2,420.78 is: 3,340.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.80 : 5,398.74 = 2,420.78 : x
  2. Step 2: Convert to fraction form
    3,912.80/5,398.74 = 2,420.78/x
  3. Step 3: Cross multiply
    3,912.80x = 5,398.74 × 2,420.78
  4. Step 4: Simplify right side
    3,912.80x = 13,069,161.82
  5. Step 5: Solve for x
    x = 13,069,161.82/3,912.80
  6. Step 6: Final answer
    x = 3,340.10

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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.