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Finding the Fourth Proportional to 21,797.99, 30,082.21 and 12,845.87

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Solution

The fourth proportional to 21,797.99, 30,082.21 and 12,845.87 is: 17,727.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,797.99 : 30,082.21 = 12,845.87 : x
  2. Step 2: Convert to fraction form
    21,797.99/30,082.21 = 12,845.87/x
  3. Step 3: Cross multiply
    21,797.99x = 30,082.21 × 12,845.87
  4. Step 4: Simplify right side
    21,797.99x = 386,431,976.45
  5. Step 5: Solve for x
    x = 386,431,976.45/21,797.99
  6. Step 6: Final answer
    x = 17,727.88

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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.