Home / 80,739.80-121,109.70-51,288.20

Finding the Fourth Proportional to 80,739.80, 121,109.70 and 51,288.20

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Solution

The fourth proportional to 80,739.80, 121,109.70 and 51,288.20 is: 76,932.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,739.80 : 121,109.70 = 51,288.20 : x
  2. Step 2: Convert to fraction form
    80,739.80/121,109.70 = 51,288.20/x
  3. Step 3: Cross multiply
    80,739.80x = 121,109.70 × 51,288.20
  4. Step 4: Simplify right side
    80,739.80x = 6,211,498,515.54
  5. Step 5: Solve for x
    x = 6,211,498,515.54/80,739.80
  6. Step 6: Final answer
    x = 76,932.30

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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.