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Finding the Fourth Proportional to 21,859.80, 30,093.56 and 20,855.52

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Solution

The fourth proportional to 21,859.80, 30,093.56 and 20,855.52 is: 28,711.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,859.80 : 30,093.56 = 20,855.52 : x
  2. Step 2: Convert to fraction form
    21,859.80/30,093.56 = 20,855.52/x
  3. Step 3: Cross multiply
    21,859.80x = 30,093.56 × 20,855.52
  4. Step 4: Simplify right side
    21,859.80x = 627,616,816.38
  5. Step 5: Solve for x
    x = 627,616,816.38/21,859.80
  6. Step 6: Final answer
    x = 28,711.01

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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.