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Finding the Fourth Proportional to 139,080.97, 191,956.31 and 81,720.28

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Solution

The fourth proportional to 139,080.97, 191,956.31 and 81,720.28 is: 112,788.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,080.97 : 191,956.31 = 81,720.28 : x
  2. Step 2: Convert to fraction form
    139,080.97/191,956.31 = 81,720.28/x
  3. Step 3: Cross multiply
    139,080.97x = 191,956.31 × 81,720.28
  4. Step 4: Simplify right side
    139,080.97x = 15,686,722,229.17
  5. Step 5: Solve for x
    x = 15,686,722,229.17/139,080.97
  6. Step 6: Final answer
    x = 112,788.42

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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.