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Finding the Fourth Proportional to 21,818.44, 30,105.84 and 20,711.44

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Solution

The fourth proportional to 21,818.44, 30,105.84 and 20,711.44 is: 28,578.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,818.44 : 30,105.84 = 20,711.44 : x
  2. Step 2: Convert to fraction form
    21,818.44/30,105.84 = 20,711.44/x
  3. Step 3: Cross multiply
    21,818.44x = 30,105.84 × 20,711.44
  4. Step 4: Simplify right side
    21,818.44x = 623,535,298.81
  5. Step 5: Solve for x
    x = 623,535,298.81/21,818.44
  6. Step 6: Final answer
    x = 28,578.36

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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.