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Finding the Fourth Proportional to 138,635.76, 191,308.44 and 79,015.92

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Solution

The fourth proportional to 138,635.76, 191,308.44 and 79,015.92 is: 109,036.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,635.76 : 191,308.44 = 79,015.92 : x
  2. Step 2: Convert to fraction form
    138,635.76/191,308.44 = 79,015.92/x
  3. Step 3: Cross multiply
    138,635.76x = 191,308.44 × 79,015.92
  4. Step 4: Simplify right side
    138,635.76x = 15,116,412,390.36
  5. Step 5: Solve for x
    x = 15,116,412,390.36/138,635.76
  6. Step 6: Final answer
    x = 109,036.89

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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.