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Finding the Fourth Proportional to 202.73, 279.56 and 128.91

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Solution

The fourth proportional to 202.73, 279.56 and 128.91 is: 177.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.73 : 279.56 = 128.91 : x
  2. Step 2: Convert to fraction form
    202.73/279.56 = 128.91/x
  3. Step 3: Cross multiply
    202.73x = 279.56 × 128.91
  4. Step 4: Simplify right side
    202.73x = 36,037.44
  5. Step 5: Solve for x
    x = 36,037.44/202.73
  6. Step 6: Final answer
    x = 177.77

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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.