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Finding the Fourth Proportional to 92,768.78, 127,963.96 and 81,979.03

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Solution

The fourth proportional to 92,768.78, 127,963.96 and 81,979.03 is: 113,080.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,768.78 : 127,963.96 = 81,979.03 : x
  2. Step 2: Convert to fraction form
    92,768.78/127,963.96 = 81,979.03/x
  3. Step 3: Cross multiply
    92,768.78x = 127,963.96 × 81,979.03
  4. Step 4: Simplify right side
    92,768.78x = 10,490,360,790.90
  5. Step 5: Solve for x
    x = 10,490,360,790.90/92,768.78
  6. Step 6: Final answer
    x = 113,080.72

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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.