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Finding the Fourth Proportional to 81,079.77, 111,790.80 and 66,689.31

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Solution

The fourth proportional to 81,079.77, 111,790.80 and 66,689.31 is: 91,949.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,079.77 : 111,790.80 = 66,689.31 : x
  2. Step 2: Convert to fraction form
    81,079.77/111,790.80 = 66,689.31/x
  3. Step 3: Cross multiply
    81,079.77x = 111,790.80 × 66,689.31
  4. Step 4: Simplify right side
    81,079.77x = 7,455,251,316.35
  5. Step 5: Solve for x
    x = 7,455,251,316.35/81,079.77
  6. Step 6: Final answer
    x = 91,949.59

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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.