Home / 3,989.45-5,505.77-2,221.17

Finding the Fourth Proportional to 3,989.45, 5,505.77 and 2,221.17

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Solution

The fourth proportional to 3,989.45, 5,505.77 and 2,221.17 is: 3,065.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.45 : 5,505.77 = 2,221.17 : x
  2. Step 2: Convert to fraction form
    3,989.45/5,505.77 = 2,221.17/x
  3. Step 3: Cross multiply
    3,989.45x = 5,505.77 × 2,221.17
  4. Step 4: Simplify right side
    3,989.45x = 12,229,267.03
  5. Step 5: Solve for x
    x = 12,229,267.03/3,989.45
  6. Step 6: Final answer
    x = 3,065.40

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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.