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Finding the Fourth Proportional to 20,591.49, 30,921.41 and 12,849.51

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Solution

The fourth proportional to 20,591.49, 30,921.41 and 12,849.51 is: 19,295.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,591.49 : 30,921.41 = 12,849.51 : x
  2. Step 2: Convert to fraction form
    20,591.49/30,921.41 = 12,849.51/x
  3. Step 3: Cross multiply
    20,591.49x = 30,921.41 × 12,849.51
  4. Step 4: Simplify right side
    20,591.49x = 397,324,902.76
  5. Step 5: Solve for x
    x = 397,324,902.76/20,591.49
  6. Step 6: Final answer
    x = 19,295.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.