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Finding the Fourth Proportional to 138,911.64, 191,697.89 and 75,249.69

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Solution

The fourth proportional to 138,911.64, 191,697.89 and 75,249.69 is: 103,844.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,911.64 : 191,697.89 = 75,249.69 : x
  2. Step 2: Convert to fraction form
    138,911.64/191,697.89 = 75,249.69/x
  3. Step 3: Cross multiply
    138,911.64x = 191,697.89 × 75,249.69
  4. Step 4: Simplify right side
    138,911.64x = 14,425,206,419.91
  5. Step 5: Solve for x
    x = 14,425,206,419.91/138,911.64
  6. Step 6: Final answer
    x = 103,844.48

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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.