Home / 81,721.20-122,610.60-78,841.20

Finding the Fourth Proportional to 81,721.20, 122,610.60 and 78,841.20

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Solution

The fourth proportional to 81,721.20, 122,610.60 and 78,841.20 is: 118,289.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,721.20 : 122,610.60 = 78,841.20 : x
  2. Step 2: Convert to fraction form
    81,721.20/122,610.60 = 78,841.20/x
  3. Step 3: Cross multiply
    81,721.20x = 122,610.60 × 78,841.20
  4. Step 4: Simplify right side
    81,721.20x = 9,666,766,836.72
  5. Step 5: Solve for x
    x = 9,666,766,836.72/81,721.20
  6. Step 6: Final answer
    x = 118,289.59

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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.