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Finding the Fourth Proportional to 161.72, 242.40 and 80.39

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Solution

The fourth proportional to 161.72, 242.40 and 80.39 is: 120.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.72 : 242.40 = 80.39 : x
  2. Step 2: Convert to fraction form
    161.72/242.40 = 80.39/x
  3. Step 3: Cross multiply
    161.72x = 242.40 × 80.39
  4. Step 4: Simplify right side
    161.72x = 19,486.54
  5. Step 5: Solve for x
    x = 19,486.54/161.72
  6. Step 6: Final answer
    x = 120.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.