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Finding the Fourth Proportional to 21,355.20, 32,193 and 19,928

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Solution

The fourth proportional to 21,355.20, 32,193 and 19,928 is: 30,041.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,355.20 : 32,193 = 19,928 : x
  2. Step 2: Convert to fraction form
    21,355.20/32,193 = 19,928/x
  3. Step 3: Cross multiply
    21,355.20x = 32,193 × 19,928
  4. Step 4: Simplify right side
    21,355.20x = 641,542,104
  5. Step 5: Solve for x
    x = 641,542,104/21,355.20
  6. Step 6: Final answer
    x = 30,041.49

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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.