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Finding the Fourth Proportional to 138.43, 190.99 and 79.41

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Solution

The fourth proportional to 138.43, 190.99 and 79.41 is: 109.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.43 : 190.99 = 79.41 : x
  2. Step 2: Convert to fraction form
    138.43/190.99 = 79.41/x
  3. Step 3: Cross multiply
    138.43x = 190.99 × 79.41
  4. Step 4: Simplify right side
    138.43x = 15,166.12
  5. Step 5: Solve for x
    x = 15,166.12/138.43
  6. Step 6: Final answer
    x = 109.56

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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.