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Finding the Fourth Proportional to 243.57, 335.97 and 156.09

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Solution

The fourth proportional to 243.57, 335.97 and 156.09 is: 215.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.57 : 335.97 = 156.09 : x
  2. Step 2: Convert to fraction form
    243.57/335.97 = 156.09/x
  3. Step 3: Cross multiply
    243.57x = 335.97 × 156.09
  4. Step 4: Simplify right side
    243.57x = 52,441.56
  5. Step 5: Solve for x
    x = 52,441.56/243.57
  6. Step 6: Final answer
    x = 215.30

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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.