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Finding the Fourth Proportional to 80,487.78, 120,736.49 and 21,323.28

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Solution

The fourth proportional to 80,487.78, 120,736.49 and 21,323.28 is: 31,986.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,487.78 : 120,736.49 = 21,323.28 : x
  2. Step 2: Convert to fraction form
    80,487.78/120,736.49 = 21,323.28/x
  3. Step 3: Cross multiply
    80,487.78x = 120,736.49 × 21,323.28
  4. Step 4: Simplify right side
    80,487.78x = 2,574,497,982.49
  5. Step 5: Solve for x
    x = 2,574,497,982.49/80,487.78
  6. Step 6: Final answer
    x = 31,986.20

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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.