Home / 3,989.91-5,506.11-2,221.68

Finding the Fourth Proportional to 3,989.91, 5,506.11 and 2,221.68

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Solution

The fourth proportional to 3,989.91, 5,506.11 and 2,221.68 is: 3,065.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.91 : 5,506.11 = 2,221.68 : x
  2. Step 2: Convert to fraction form
    3,989.91/5,506.11 = 2,221.68/x
  3. Step 3: Cross multiply
    3,989.91x = 5,506.11 × 2,221.68
  4. Step 4: Simplify right side
    3,989.91x = 12,232,814.46
  5. Step 5: Solve for x
    x = 12,232,814.46/3,989.91
  6. Step 6: Final answer
    x = 3,065.94

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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.