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Finding the Fourth Proportional to 81,351.78, 112,207.59 and 74,659.02

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Solution

The fourth proportional to 81,351.78, 112,207.59 and 74,659.02 is: 102,976.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,351.78 : 112,207.59 = 74,659.02 : x
  2. Step 2: Convert to fraction form
    81,351.78/112,207.59 = 74,659.02/x
  3. Step 3: Cross multiply
    81,351.78x = 112,207.59 × 74,659.02
  4. Step 4: Simplify right side
    81,351.78x = 8,377,308,705.96
  5. Step 5: Solve for x
    x = 8,377,308,705.96/81,351.78
  6. Step 6: Final answer
    x = 102,976.34

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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.