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Finding the Fourth Proportional to 3,868.35, 5,338.35 and 2,189.76

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Solution

The fourth proportional to 3,868.35, 5,338.35 and 2,189.76 is: 3,021.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,868.35 : 5,338.35 = 2,189.76 : x
  2. Step 2: Convert to fraction form
    3,868.35/5,338.35 = 2,189.76/x
  3. Step 3: Cross multiply
    3,868.35x = 5,338.35 × 2,189.76
  4. Step 4: Simplify right side
    3,868.35x = 11,689,705.30
  5. Step 5: Solve for x
    x = 11,689,705.30/3,868.35
  6. Step 6: Final answer
    x = 3,021.88

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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.