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Finding the Fourth Proportional to 138,717.64, 191,379.13 and 91,035.78

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Solution

The fourth proportional to 138,717.64, 191,379.13 and 91,035.78 is: 125,595.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,717.64 : 191,379.13 = 91,035.78 : x
  2. Step 2: Convert to fraction form
    138,717.64/191,379.13 = 91,035.78/x
  3. Step 3: Cross multiply
    138,717.64x = 191,379.13 × 91,035.78
  4. Step 4: Simplify right side
    138,717.64x = 17,422,348,375.27
  5. Step 5: Solve for x
    x = 17,422,348,375.27/138,717.64
  6. Step 6: Final answer
    x = 125,595.77

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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.