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Finding the Fourth Proportional to 2,643.80, 3,960.90 and 2,154.20

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Solution

The fourth proportional to 2,643.80, 3,960.90 and 2,154.20 is: 3,227.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,643.80 : 3,960.90 = 2,154.20 : x
  2. Step 2: Convert to fraction form
    2,643.80/3,960.90 = 2,154.20/x
  3. Step 3: Cross multiply
    2,643.80x = 3,960.90 × 2,154.20
  4. Step 4: Simplify right side
    2,643.80x = 8,532,570.78
  5. Step 5: Solve for x
    x = 8,532,570.78/2,643.80
  6. Step 6: Final answer
    x = 3,227.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.