Home / 81,766.20-122,822.10-78,828.60

Finding the Fourth Proportional to 81,766.20, 122,822.10 and 78,828.60

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Solution

The fourth proportional to 81,766.20, 122,822.10 and 78,828.60 is: 118,409.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,766.20 : 122,822.10 = 78,828.60 : x
  2. Step 2: Convert to fraction form
    81,766.20/122,822.10 = 78,828.60/x
  3. Step 3: Cross multiply
    81,766.20x = 122,822.10 × 78,828.60
  4. Step 4: Simplify right side
    81,766.20x = 9,681,894,192.06
  5. Step 5: Solve for x
    x = 9,681,894,192.06/81,766.20
  6. Step 6: Final answer
    x = 118,409.49

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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.