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Finding the Fourth Proportional to 242.78, 364.20 and 80.42

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Solution

The fourth proportional to 242.78, 364.20 and 80.42 is: 120.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.78 : 364.20 = 80.42 : x
  2. Step 2: Convert to fraction form
    242.78/364.20 = 80.42/x
  3. Step 3: Cross multiply
    242.78x = 364.20 × 80.42
  4. Step 4: Simplify right side
    242.78x = 29,287.14
  5. Step 5: Solve for x
    x = 29,287.14/242.78
  6. Step 6: Final answer
    x = 120.63

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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.