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Finding the Fourth Proportional to 81,774.40, 122,661.60 and 68,555.20

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Solution

The fourth proportional to 81,774.40, 122,661.60 and 68,555.20 is: 102,832.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,774.40 : 122,661.60 = 68,555.20 : x
  2. Step 2: Convert to fraction form
    81,774.40/122,661.60 = 68,555.20/x
  3. Step 3: Cross multiply
    81,774.40x = 122,661.60 × 68,555.20
  4. Step 4: Simplify right side
    81,774.40x = 8,409,090,520.32
  5. Step 5: Solve for x
    x = 8,409,090,520.32/81,774.40
  6. Step 6: Final answer
    x = 102,832.80

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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.