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Finding the Fourth Proportional to 6,660.40, 9,990.60 and 5,105.20

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Solution

The fourth proportional to 6,660.40, 9,990.60 and 5,105.20 is: 7,657.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,660.40 : 9,990.60 = 5,105.20 : x
  2. Step 2: Convert to fraction form
    6,660.40/9,990.60 = 5,105.20/x
  3. Step 3: Cross multiply
    6,660.40x = 9,990.60 × 5,105.20
  4. Step 4: Simplify right side
    6,660.40x = 51,004,011.12
  5. Step 5: Solve for x
    x = 51,004,011.12/6,660.40
  6. Step 6: Final answer
    x = 7,657.80

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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.