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Finding the Fourth Proportional to 161.60, 242.19 and 80.49

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Solution

The fourth proportional to 161.60, 242.19 and 80.49 is: 120.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.60 : 242.19 = 80.49 : x
  2. Step 2: Convert to fraction form
    161.60/242.19 = 80.49/x
  3. Step 3: Cross multiply
    161.60x = 242.19 × 80.49
  4. Step 4: Simplify right side
    161.60x = 19,494.78
  5. Step 5: Solve for x
    x = 19,494.78/161.60
  6. Step 6: Final answer
    x = 120.64

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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.