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Finding the Fourth Proportional to 20,428.08, 30,781.08 and 16,811.44

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Solution

The fourth proportional to 20,428.08, 30,781.08 and 16,811.44 is: 25,331.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.08 : 30,781.08 = 16,811.44 : x
  2. Step 2: Convert to fraction form
    20,428.08/30,781.08 = 16,811.44/x
  3. Step 3: Cross multiply
    20,428.08x = 30,781.08 × 16,811.44
  4. Step 4: Simplify right side
    20,428.08x = 517,474,279.56
  5. Step 5: Solve for x
    x = 517,474,279.56/20,428.08
  6. Step 6: Final answer
    x = 25,331.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.