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Finding the Fourth Proportional to 80,402.01, 120,608.78 and 21,237.09

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Solution

The fourth proportional to 80,402.01, 120,608.78 and 21,237.09 is: 31,857.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,402.01 : 120,608.78 = 21,237.09 : x
  2. Step 2: Convert to fraction form
    80,402.01/120,608.78 = 21,237.09/x
  3. Step 3: Cross multiply
    80,402.01x = 120,608.78 × 21,237.09
  4. Step 4: Simplify right side
    80,402.01x = 2,561,379,409.46
  5. Step 5: Solve for x
    x = 2,561,379,409.46/80,402.01
  6. Step 6: Final answer
    x = 31,857.16

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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.