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Finding the Fourth Proportional to 3,808.40, 5,722.20 and 2,422.40

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Solution

The fourth proportional to 3,808.40, 5,722.20 and 2,422.40 is: 3,639.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,808.40 : 5,722.20 = 2,422.40 : x
  2. Step 2: Convert to fraction form
    3,808.40/5,722.20 = 2,422.40/x
  3. Step 3: Cross multiply
    3,808.40x = 5,722.20 × 2,422.40
  4. Step 4: Simplify right side
    3,808.40x = 13,861,457.28
  5. Step 5: Solve for x
    x = 13,861,457.28/3,808.40
  6. Step 6: Final answer
    x = 3,639.71

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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.