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Finding the Fourth Proportional to 20,221, 30,331.50 and 5,629

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Solution

The fourth proportional to 20,221, 30,331.50 and 5,629 is: 8,443.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,221 : 30,331.50 = 5,629 : x
  2. Step 2: Convert to fraction form
    20,221/30,331.50 = 5,629/x
  3. Step 3: Cross multiply
    20,221x = 30,331.50 × 5,629
  4. Step 4: Simplify right side
    20,221x = 170,736,013.50
  5. Step 5: Solve for x
    x = 170,736,013.50/20,221
  6. Step 6: Final answer
    x = 8,443.50

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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.