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Finding the Fourth Proportional to 20,639.89, 30,972.17 and 7,493.28

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Solution

The fourth proportional to 20,639.89, 30,972.17 and 7,493.28 is: 11,244.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.89 : 30,972.17 = 7,493.28 : x
  2. Step 2: Convert to fraction form
    20,639.89/30,972.17 = 7,493.28/x
  3. Step 3: Cross multiply
    20,639.89x = 30,972.17 × 7,493.28
  4. Step 4: Simplify right side
    20,639.89x = 232,083,305.93
  5. Step 5: Solve for x
    x = 232,083,305.93/20,639.89
  6. Step 6: Final answer
    x = 11,244.41

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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.