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Finding the Fourth Proportional to 7,139.70, 10,709.97 and 2,757.18

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Solution

The fourth proportional to 7,139.70, 10,709.97 and 2,757.18 is: 4,135.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.70 : 10,709.97 = 2,757.18 : x
  2. Step 2: Convert to fraction form
    7,139.70/10,709.97 = 2,757.18/x
  3. Step 3: Cross multiply
    7,139.70x = 10,709.97 × 2,757.18
  4. Step 4: Simplify right side
    7,139.70x = 29,529,315.08
  5. Step 5: Solve for x
    x = 29,529,315.08/7,139.70
  6. Step 6: Final answer
    x = 4,135.93

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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.