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Finding the Fourth Proportional to 6,934.20, 10,379.70 and 4,990.20

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Solution

The fourth proportional to 6,934.20, 10,379.70 and 4,990.20 is: 7,469.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,934.20 : 10,379.70 = 4,990.20 : x
  2. Step 2: Convert to fraction form
    6,934.20/10,379.70 = 4,990.20/x
  3. Step 3: Cross multiply
    6,934.20x = 10,379.70 × 4,990.20
  4. Step 4: Simplify right side
    6,934.20x = 51,796,778.94
  5. Step 5: Solve for x
    x = 51,796,778.94/6,934.20
  6. Step 6: Final answer
    x = 7,469.76

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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.