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Finding the Fourth Proportional to 81,378.91, 122,130.87 and 36,414.19

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Solution

The fourth proportional to 81,378.91, 122,130.87 and 36,414.19 is: 54,649.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,378.91 : 122,130.87 = 36,414.19 : x
  2. Step 2: Convert to fraction form
    81,378.91/122,130.87 = 36,414.19/x
  3. Step 3: Cross multiply
    81,378.91x = 122,130.87 × 36,414.19
  4. Step 4: Simplify right side
    81,378.91x = 4,447,296,705.05
  5. Step 5: Solve for x
    x = 4,447,296,705.05/81,378.91
  6. Step 6: Final answer
    x = 54,649.25

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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.