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Finding the Fourth Proportional to 242.68, 363.91 and 80.31

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Solution

The fourth proportional to 242.68, 363.91 and 80.31 is: 120.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.68 : 363.91 = 80.31 : x
  2. Step 2: Convert to fraction form
    242.68/363.91 = 80.31/x
  3. Step 3: Cross multiply
    242.68x = 363.91 × 80.31
  4. Step 4: Simplify right side
    242.68x = 29,225.61
  5. Step 5: Solve for x
    x = 29,225.61/242.68
  6. Step 6: Final answer
    x = 120.43

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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.