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Finding the Fourth Proportional to 161.52, 223.12 and 128.73

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Solution

The fourth proportional to 161.52, 223.12 and 128.73 is: 177.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.52 : 223.12 = 128.73 : x
  2. Step 2: Convert to fraction form
    161.52/223.12 = 128.73/x
  3. Step 3: Cross multiply
    161.52x = 223.12 × 128.73
  4. Step 4: Simplify right side
    161.52x = 28,721.12
  5. Step 5: Solve for x
    x = 28,721.12/161.52
  6. Step 6: Final answer
    x = 177.82

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