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Finding the Fourth Proportional to 81,201.67, 112,078.61 and 65,005.72

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Solution

The fourth proportional to 81,201.67, 112,078.61 and 65,005.72 is: 89,724.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,201.67 : 112,078.61 = 65,005.72 : x
  2. Step 2: Convert to fraction form
    81,201.67/112,078.61 = 65,005.72/x
  3. Step 3: Cross multiply
    81,201.67x = 112,078.61 × 65,005.72
  4. Step 4: Simplify right side
    81,201.67x = 7,285,750,739.65
  5. Step 5: Solve for x
    x = 7,285,750,739.65/81,201.67
  6. Step 6: Final answer
    x = 89,724.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.