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Finding the Fourth Proportional to 6,979.80, 10,469.70 and 4,015.20

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Solution

The fourth proportional to 6,979.80, 10,469.70 and 4,015.20 is: 6,022.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,979.80 : 10,469.70 = 4,015.20 : x
  2. Step 2: Convert to fraction form
    6,979.80/10,469.70 = 4,015.20/x
  3. Step 3: Cross multiply
    6,979.80x = 10,469.70 × 4,015.20
  4. Step 4: Simplify right side
    6,979.80x = 42,037,939.44
  5. Step 5: Solve for x
    x = 42,037,939.44/6,979.80
  6. Step 6: Final answer
    x = 6,022.80

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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.