Home / 3,990.24-5,505.74-2,221.76

Finding the Fourth Proportional to 3,990.24, 5,505.74 and 2,221.76

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Solution

The fourth proportional to 3,990.24, 5,505.74 and 2,221.76 is: 3,065.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.24 : 5,505.74 = 2,221.76 : x
  2. Step 2: Convert to fraction form
    3,990.24/5,505.74 = 2,221.76/x
  3. Step 3: Cross multiply
    3,990.24x = 5,505.74 × 2,221.76
  4. Step 4: Simplify right side
    3,990.24x = 12,232,432.90
  5. Step 5: Solve for x
    x = 12,232,432.90/3,990.24
  6. Step 6: Final answer
    x = 3,065.59

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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.