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Finding the Fourth Proportional to 3,990.84, 5,507.67 and 2,223

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Solution

The fourth proportional to 3,990.84, 5,507.67 and 2,223 is: 3,067.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.84 : 5,507.67 = 2,223 : x
  2. Step 2: Convert to fraction form
    3,990.84/5,507.67 = 2,223/x
  3. Step 3: Cross multiply
    3,990.84x = 5,507.67 × 2,223
  4. Step 4: Simplify right side
    3,990.84x = 12,243,550.41
  5. Step 5: Solve for x
    x = 12,243,550.41/3,990.84
  6. Step 6: Final answer
    x = 3,067.91

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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.