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Finding the Fourth Proportional to 138.15, 190.59 and 82.79

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Solution

The fourth proportional to 138.15, 190.59 and 82.79 is: 114.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.15 : 190.59 = 82.79 : x
  2. Step 2: Convert to fraction form
    138.15/190.59 = 82.79/x
  3. Step 3: Cross multiply
    138.15x = 190.59 × 82.79
  4. Step 4: Simplify right side
    138.15x = 15,779.27
  5. Step 5: Solve for x
    x = 15,779.27/138.15
  6. Step 6: Final answer
    x = 114.22

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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.