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Finding the Fourth Proportional to 243.17, 335.39 and 155.85

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Solution

The fourth proportional to 243.17, 335.39 and 155.85 is: 214.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.17 : 335.39 = 155.85 : x
  2. Step 2: Convert to fraction form
    243.17/335.39 = 155.85/x
  3. Step 3: Cross multiply
    243.17x = 335.39 × 155.85
  4. Step 4: Simplify right side
    243.17x = 52,269.75
  5. Step 5: Solve for x
    x = 52,269.75/243.17
  6. Step 6: Final answer
    x = 214.95

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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.