Home / 3,990.05-5,506.14-2,221.56

Finding the Fourth Proportional to 3,990.05, 5,506.14 and 2,221.56

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Solution

The fourth proportional to 3,990.05, 5,506.14 and 2,221.56 is: 3,065.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.05 : 5,506.14 = 2,221.56 : x
  2. Step 2: Convert to fraction form
    3,990.05/5,506.14 = 2,221.56/x
  3. Step 3: Cross multiply
    3,990.05x = 5,506.14 × 2,221.56
  4. Step 4: Simplify right side
    3,990.05x = 12,232,220.38
  5. Step 5: Solve for x
    x = 12,232,220.38/3,990.05
  6. Step 6: Final answer
    x = 3,065.68

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Half scale
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Double scale
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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.