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Finding the Fourth Proportional to 170.82, 235.89 and 138.15

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Solution

The fourth proportional to 170.82, 235.89 and 138.15 is: 190.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.82 : 235.89 = 138.15 : x
  2. Step 2: Convert to fraction form
    170.82/235.89 = 138.15/x
  3. Step 3: Cross multiply
    170.82x = 235.89 × 138.15
  4. Step 4: Simplify right side
    170.82x = 32,588.20
  5. Step 5: Solve for x
    x = 32,588.20/170.82
  6. Step 6: Final answer
    x = 190.78

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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.