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Finding the Fourth Proportional to 3,886.80, 5,365.89 and 2,983.20

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Solution

The fourth proportional to 3,886.80, 5,365.89 and 2,983.20 is: 4,118.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,886.80 : 5,365.89 = 2,983.20 : x
  2. Step 2: Convert to fraction form
    3,886.80/5,365.89 = 2,983.20/x
  3. Step 3: Cross multiply
    3,886.80x = 5,365.89 × 2,983.20
  4. Step 4: Simplify right side
    3,886.80x = 16,007,523.05
  5. Step 5: Solve for x
    x = 16,007,523.05/3,886.80
  6. Step 6: Final answer
    x = 4,118.43

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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.