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Finding the Fourth Proportional to 6,972.22, 9,620.02 and 3,989.70

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Solution

The fourth proportional to 6,972.22, 9,620.02 and 3,989.70 is: 5,504.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,972.22 : 9,620.02 = 3,989.70 : x
  2. Step 2: Convert to fraction form
    6,972.22/9,620.02 = 3,989.70/x
  3. Step 3: Cross multiply
    6,972.22x = 9,620.02 × 3,989.70
  4. Step 4: Simplify right side
    6,972.22x = 38,380,993.79
  5. Step 5: Solve for x
    x = 38,380,993.79/6,972.22
  6. Step 6: Final answer
    x = 5,504.85

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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.