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Finding the Fourth Proportional to 80,857.80, 121,286.70 and 51,406.20

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Solution

The fourth proportional to 80,857.80, 121,286.70 and 51,406.20 is: 77,109.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,857.80 : 121,286.70 = 51,406.20 : x
  2. Step 2: Convert to fraction form
    80,857.80/121,286.70 = 51,406.20/x
  3. Step 3: Cross multiply
    80,857.80x = 121,286.70 × 51,406.20
  4. Step 4: Simplify right side
    80,857.80x = 6,234,888,357.54
  5. Step 5: Solve for x
    x = 6,234,888,357.54/80,857.80
  6. Step 6: Final answer
    x = 77,109.30

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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.