Home / 81,118.20-121,604.40-51,520.80

Finding the Fourth Proportional to 81,118.20, 121,604.40 and 51,520.80

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Solution

The fourth proportional to 81,118.20, 121,604.40 and 51,520.80 is: 77,234.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,118.20 : 121,604.40 = 51,520.80 : x
  2. Step 2: Convert to fraction form
    81,118.20/121,604.40 = 51,520.80/x
  3. Step 3: Cross multiply
    81,118.20x = 121,604.40 × 51,520.80
  4. Step 4: Simplify right side
    81,118.20x = 6,265,155,971.52
  5. Step 5: Solve for x
    x = 6,265,155,971.52/81,118.20
  6. Step 6: Final answer
    x = 77,234.90

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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.