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Finding the Fourth Proportional to 80,366.78, 120,555.95 and 21,201.75

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Solution

The fourth proportional to 80,366.78, 120,555.95 and 21,201.75 is: 31,804.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,366.78 : 120,555.95 = 21,201.75 : x
  2. Step 2: Convert to fraction form
    80,366.78/120,555.95 = 21,201.75/x
  3. Step 3: Cross multiply
    80,366.78x = 120,555.95 × 21,201.75
  4. Step 4: Simplify right side
    80,366.78x = 2,555,997,006.90
  5. Step 5: Solve for x
    x = 2,555,997,006.90/80,366.78
  6. Step 6: Final answer
    x = 31,804.15

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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.