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Finding the Fourth Proportional to 120,818.20, 181,227.30 and 76,640.80

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Solution

The fourth proportional to 120,818.20, 181,227.30 and 76,640.80 is: 114,961.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,818.20 : 181,227.30 = 76,640.80 : x
  2. Step 2: Convert to fraction form
    120,818.20/181,227.30 = 76,640.80/x
  3. Step 3: Cross multiply
    120,818.20x = 181,227.30 × 76,640.80
  4. Step 4: Simplify right side
    120,818.20x = 13,889,405,253.84
  5. Step 5: Solve for x
    x = 13,889,405,253.84/120,818.20
  6. Step 6: Final answer
    x = 114,961.20

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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.