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Finding the Fourth Proportional to 21,620.10, 32,411.01 and 8,481.90

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Solution

The fourth proportional to 21,620.10, 32,411.01 and 8,481.90 is: 12,715.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,620.10 : 32,411.01 = 8,481.90 : x
  2. Step 2: Convert to fraction form
    21,620.10/32,411.01 = 8,481.90/x
  3. Step 3: Cross multiply
    21,620.10x = 32,411.01 × 8,481.90
  4. Step 4: Simplify right side
    21,620.10x = 274,906,945.72
  5. Step 5: Solve for x
    x = 274,906,945.72/21,620.10
  6. Step 6: Final answer
    x = 12,715.34

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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.