Home / 3,990.32-5,506.51-2,221.90

Finding the Fourth Proportional to 3,990.32, 5,506.51 and 2,221.90

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Solution

The fourth proportional to 3,990.32, 5,506.51 and 2,221.90 is: 3,066.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.32 : 5,506.51 = 2,221.90 : x
  2. Step 2: Convert to fraction form
    3,990.32/5,506.51 = 2,221.90/x
  3. Step 3: Cross multiply
    3,990.32x = 5,506.51 × 2,221.90
  4. Step 4: Simplify right side
    3,990.32x = 12,234,914.57
  5. Step 5: Solve for x
    x = 12,234,914.57/3,990.32
  6. Step 6: Final answer
    x = 3,066.15

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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.