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Finding the Fourth Proportional to 120.50, 181.15 and 111.59

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Solution

The fourth proportional to 120.50, 181.15 and 111.59 is: 167.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.50 : 181.15 = 111.59 : x
  2. Step 2: Convert to fraction form
    120.50/181.15 = 111.59/x
  3. Step 3: Cross multiply
    120.50x = 181.15 × 111.59
  4. Step 4: Simplify right side
    120.50x = 20,214.53
  5. Step 5: Solve for x
    x = 20,214.53/120.50
  6. Step 6: Final answer
    x = 167.76

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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.