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Finding the Fourth Proportional to 7,911.21, 10,921.05 and 5,082.69

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Solution

The fourth proportional to 7,911.21, 10,921.05 and 5,082.69 is: 7,016.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,911.21 : 10,921.05 = 5,082.69 : x
  2. Step 2: Convert to fraction form
    7,911.21/10,921.05 = 5,082.69/x
  3. Step 3: Cross multiply
    7,911.21x = 10,921.05 × 5,082.69
  4. Step 4: Simplify right side
    7,911.21x = 55,508,311.62
  5. Step 5: Solve for x
    x = 55,508,311.62/7,911.21
  6. Step 6: Final answer
    x = 7,016.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.