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Finding the Fourth Proportional to 7,896.20, 11,857.10 and 5,720.20

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Solution

The fourth proportional to 7,896.20, 11,857.10 and 5,720.20 is: 8,589.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,896.20 : 11,857.10 = 5,720.20 : x
  2. Step 2: Convert to fraction form
    7,896.20/11,857.10 = 5,720.20/x
  3. Step 3: Cross multiply
    7,896.20x = 11,857.10 × 5,720.20
  4. Step 4: Simplify right side
    7,896.20x = 67,824,983.42
  5. Step 5: Solve for x
    x = 67,824,983.42/7,896.20
  6. Step 6: Final answer
    x = 8,589.57

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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.