Home / 3,989.33-5,505.21-2,220.89

Finding the Fourth Proportional to 3,989.33, 5,505.21 and 2,220.89

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Solution

The fourth proportional to 3,989.33, 5,505.21 and 2,220.89 is: 3,064.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.33 : 5,505.21 = 2,220.89 : x
  2. Step 2: Convert to fraction form
    3,989.33/5,505.21 = 2,220.89/x
  3. Step 3: Cross multiply
    3,989.33x = 5,505.21 × 2,220.89
  4. Step 4: Simplify right side
    3,989.33x = 12,226,465.84
  5. Step 5: Solve for x
    x = 12,226,465.84/3,989.33
  6. Step 6: Final answer
    x = 3,064.79

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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.