Home / 81,048.20-121,499.40-51,450.80

Finding the Fourth Proportional to 81,048.20, 121,499.40 and 51,450.80

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Solution

The fourth proportional to 81,048.20, 121,499.40 and 51,450.80 is: 77,129.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,048.20 : 121,499.40 = 51,450.80 : x
  2. Step 2: Convert to fraction form
    81,048.20/121,499.40 = 51,450.80/x
  3. Step 3: Cross multiply
    81,048.20x = 121,499.40 × 51,450.80
  4. Step 4: Simplify right side
    81,048.20x = 6,251,241,329.52
  5. Step 5: Solve for x
    x = 6,251,241,329.52/81,048.20
  6. Step 6: Final answer
    x = 77,129.92

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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.