Home / 3,970.28-5,478.77-2,201.78

Finding the Fourth Proportional to 3,970.28, 5,478.77 and 2,201.78

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Solution

The fourth proportional to 3,970.28, 5,478.77 and 2,201.78 is: 3,038.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.28 : 5,478.77 = 2,201.78 : x
  2. Step 2: Convert to fraction form
    3,970.28/5,478.77 = 2,201.78/x
  3. Step 3: Cross multiply
    3,970.28x = 5,478.77 × 2,201.78
  4. Step 4: Simplify right side
    3,970.28x = 12,063,065.41
  5. Step 5: Solve for x
    x = 12,063,065.41/3,970.28
  6. Step 6: Final answer
    x = 3,038.34

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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.