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Finding the Fourth Proportional to 3,920.40, 5,362.20 and 3,823.20

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Solution

The fourth proportional to 3,920.40, 5,362.20 and 3,823.20 is: 5,229.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.40 : 5,362.20 = 3,823.20 : x
  2. Step 2: Convert to fraction form
    3,920.40/5,362.20 = 3,823.20/x
  3. Step 3: Cross multiply
    3,920.40x = 5,362.20 × 3,823.20
  4. Step 4: Simplify right side
    3,920.40x = 20,500,763.04
  5. Step 5: Solve for x
    x = 20,500,763.04/3,920.40
  6. Step 6: Final answer
    x = 5,229.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.