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Finding the Fourth Proportional to 161.12, 240.38 and 138.03

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Solution

The fourth proportional to 161.12, 240.38 and 138.03 is: 205.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.12 : 240.38 = 138.03 : x
  2. Step 2: Convert to fraction form
    161.12/240.38 = 138.03/x
  3. Step 3: Cross multiply
    161.12x = 240.38 × 138.03
  4. Step 4: Simplify right side
    161.12x = 33,178.96
  5. Step 5: Solve for x
    x = 33,178.96/161.12
  6. Step 6: Final answer
    x = 205.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.