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Finding the Fourth Proportional to 202.17, 279.31 and 155.73

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Solution

The fourth proportional to 202.17, 279.31 and 155.73 is: 215.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.17 : 279.31 = 155.73 : x
  2. Step 2: Convert to fraction form
    202.17/279.31 = 155.73/x
  3. Step 3: Cross multiply
    202.17x = 279.31 × 155.73
  4. Step 4: Simplify right side
    202.17x = 43,496.56
  5. Step 5: Solve for x
    x = 43,496.56/202.17
  6. Step 6: Final answer
    x = 215.15

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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.