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Finding the Fourth Proportional to 120.39, 180.03 and 91.23

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Solution

The fourth proportional to 120.39, 180.03 and 91.23 is: 136.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.39 : 180.03 = 91.23 : x
  2. Step 2: Convert to fraction form
    120.39/180.03 = 91.23/x
  3. Step 3: Cross multiply
    120.39x = 180.03 × 91.23
  4. Step 4: Simplify right side
    120.39x = 16,424.14
  5. Step 5: Solve for x
    x = 16,424.14/120.39
  6. Step 6: Final answer
    x = 136.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.