Home / 3,969.78-5,478.96-2,290.88

Finding the Fourth Proportional to 3,969.78, 5,478.96 and 2,290.88

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Solution

The fourth proportional to 3,969.78, 5,478.96 and 2,290.88 is: 3,161.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,969.78 : 5,478.96 = 2,290.88 : x
  2. Step 2: Convert to fraction form
    3,969.78/5,478.96 = 2,290.88/x
  3. Step 3: Cross multiply
    3,969.78x = 5,478.96 × 2,290.88
  4. Step 4: Simplify right side
    3,969.78x = 12,551,612.49
  5. Step 5: Solve for x
    x = 12,551,612.49/3,969.78
  6. Step 6: Final answer
    x = 3,161.79

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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.