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Finding the Fourth Proportional to 242.78, 335.09 and 155.43

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Solution

The fourth proportional to 242.78, 335.09 and 155.43 is: 214.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.78 : 335.09 = 155.43 : x
  2. Step 2: Convert to fraction form
    242.78/335.09 = 155.43/x
  3. Step 3: Cross multiply
    242.78x = 335.09 × 155.43
  4. Step 4: Simplify right side
    242.78x = 52,083.04
  5. Step 5: Solve for x
    x = 52,083.04/242.78
  6. Step 6: Final answer
    x = 214.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.