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Finding the Fourth Proportional to 120.96, 181.12 and 103.68

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Solution

The fourth proportional to 120.96, 181.12 and 103.68 is: 155.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.96 : 181.12 = 103.68 : x
  2. Step 2: Convert to fraction form
    120.96/181.12 = 103.68/x
  3. Step 3: Cross multiply
    120.96x = 181.12 × 103.68
  4. Step 4: Simplify right side
    120.96x = 18,778.52
  5. Step 5: Solve for x
    x = 18,778.52/120.96
  6. Step 6: Final answer
    x = 155.25

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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.