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Finding the Fourth Proportional to 138,958.08, 191,788 and 79,342.08

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Solution

The fourth proportional to 138,958.08, 191,788 and 79,342.08 is: 109,506.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,958.08 : 191,788 = 79,342.08 : x
  2. Step 2: Convert to fraction form
    138,958.08/191,788 = 79,342.08/x
  3. Step 3: Cross multiply
    138,958.08x = 191,788 × 79,342.08
  4. Step 4: Simplify right side
    138,958.08x = 15,216,858,839.04
  5. Step 5: Solve for x
    x = 15,216,858,839.04/138,958.08
  6. Step 6: Final answer
    x = 109,506.83

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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.