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Finding the Fourth Proportional to 161.68, 242.38 and 100.80

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Solution

The fourth proportional to 161.68, 242.38 and 100.80 is: 151.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.68 : 242.38 = 100.80 : x
  2. Step 2: Convert to fraction form
    161.68/242.38 = 100.80/x
  3. Step 3: Cross multiply
    161.68x = 242.38 × 100.80
  4. Step 4: Simplify right side
    161.68x = 24,431.90
  5. Step 5: Solve for x
    x = 24,431.90/161.68
  6. Step 6: Final answer
    x = 151.11

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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.