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Finding the Fourth Proportional to 6,622.40, 9,919.20 and 3,540.80

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Solution

The fourth proportional to 6,622.40, 9,919.20 and 3,540.80 is: 5,303.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,622.40 : 9,919.20 = 3,540.80 : x
  2. Step 2: Convert to fraction form
    6,622.40/9,919.20 = 3,540.80/x
  3. Step 3: Cross multiply
    6,622.40x = 9,919.20 × 3,540.80
  4. Step 4: Simplify right side
    6,622.40x = 35,121,903.36
  5. Step 5: Solve for x
    x = 35,121,903.36/6,622.40
  6. Step 6: Final answer
    x = 5,303.50

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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.