Home / 81,639.20-122,458.80-68,517.20

Finding the Fourth Proportional to 81,639.20, 122,458.80 and 68,517.20

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Solution

The fourth proportional to 81,639.20, 122,458.80 and 68,517.20 is: 102,775.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,639.20 : 122,458.80 = 68,517.20 : x
  2. Step 2: Convert to fraction form
    81,639.20/122,458.80 = 68,517.20/x
  3. Step 3: Cross multiply
    81,639.20x = 122,458.80 × 68,517.20
  4. Step 4: Simplify right side
    81,639.20x = 8,390,534,091.36
  5. Step 5: Solve for x
    x = 8,390,534,091.36/81,639.20
  6. Step 6: Final answer
    x = 102,775.80

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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.