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Finding the Fourth Proportional to 3,868.84, 5,339.24 and 2,189.61

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Solution

The fourth proportional to 3,868.84, 5,339.24 and 2,189.61 is: 3,021.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,868.84 : 5,339.24 = 2,189.61 : x
  2. Step 2: Convert to fraction form
    3,868.84/5,339.24 = 2,189.61/x
  3. Step 3: Cross multiply
    3,868.84x = 5,339.24 × 2,189.61
  4. Step 4: Simplify right side
    3,868.84x = 11,690,853.30
  5. Step 5: Solve for x
    x = 11,690,853.30/3,868.84
  6. Step 6: Final answer
    x = 3,021.80

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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.