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Finding the Fourth Proportional to 120.31, 179.62 and 103.21

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Solution

The fourth proportional to 120.31, 179.62 and 103.21 is: 154.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.31 : 179.62 = 103.21 : x
  2. Step 2: Convert to fraction form
    120.31/179.62 = 103.21/x
  3. Step 3: Cross multiply
    120.31x = 179.62 × 103.21
  4. Step 4: Simplify right side
    120.31x = 18,538.58
  5. Step 5: Solve for x
    x = 18,538.58/120.31
  6. Step 6: Final answer
    x = 154.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.