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Finding the Fourth Proportional to 21,863.75, 30,098.99 and 20,859.47

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Solution

The fourth proportional to 21,863.75, 30,098.99 and 20,859.47 is: 28,716.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,863.75 : 30,098.99 = 20,859.47 : x
  2. Step 2: Convert to fraction form
    21,863.75/30,098.99 = 20,859.47/x
  3. Step 3: Cross multiply
    21,863.75x = 30,098.99 × 20,859.47
  4. Step 4: Simplify right side
    21,863.75x = 627,848,724.14
  5. Step 5: Solve for x
    x = 627,848,724.14/21,863.75
  6. Step 6: Final answer
    x = 28,716.43

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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.