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Finding the Fourth Proportional to 80,486.78, 120,734.99 and 21,322.28

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Solution

The fourth proportional to 80,486.78, 120,734.99 and 21,322.28 is: 31,984.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,486.78 : 120,734.99 = 21,322.28 : x
  2. Step 2: Convert to fraction form
    80,486.78/120,734.99 = 21,322.28/x
  3. Step 3: Cross multiply
    80,486.78x = 120,734.99 × 21,322.28
  4. Step 4: Simplify right side
    80,486.78x = 2,574,345,262.58
  5. Step 5: Solve for x
    x = 2,574,345,262.58/80,486.78
  6. Step 6: Final answer
    x = 31,984.70

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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.