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Finding the Fourth Proportional to 138,676.66, 191,313 and 81,286.88

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Solution

The fourth proportional to 138,676.66, 191,313 and 81,286.88 is: 112,140.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,676.66 : 191,313 = 81,286.88 : x
  2. Step 2: Convert to fraction form
    138,676.66/191,313 = 81,286.88/x
  3. Step 3: Cross multiply
    138,676.66x = 191,313 × 81,286.88
  4. Step 4: Simplify right side
    138,676.66x = 15,551,237,351.72
  5. Step 5: Solve for x
    x = 15,551,237,351.72/138,676.66
  6. Step 6: Final answer
    x = 112,140.27

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1.5x scale

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.