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Finding the Fourth Proportional to 3,821.99, 5,274.29 and 2,143.40

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Solution

The fourth proportional to 3,821.99, 5,274.29 and 2,143.40 is: 2,957.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,821.99 : 5,274.29 = 2,143.40 : x
  2. Step 2: Convert to fraction form
    3,821.99/5,274.29 = 2,143.40/x
  3. Step 3: Cross multiply
    3,821.99x = 5,274.29 × 2,143.40
  4. Step 4: Simplify right side
    3,821.99x = 11,304,895.88
  5. Step 5: Solve for x
    x = 11,304,895.88/3,821.99
  6. Step 6: Final answer
    x = 2,957.85

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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.