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Finding the Fourth Proportional to 120.95, 181.73 and 85.11

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Solution

The fourth proportional to 120.95, 181.73 and 85.11 is: 127.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.95 : 181.73 = 85.11 : x
  2. Step 2: Convert to fraction form
    120.95/181.73 = 85.11/x
  3. Step 3: Cross multiply
    120.95x = 181.73 × 85.11
  4. Step 4: Simplify right side
    120.95x = 15,467.04
  5. Step 5: Solve for x
    x = 15,467.04/120.95
  6. Step 6: Final answer
    x = 127.88

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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.