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Finding the Fourth Proportional to 120.97, 181.50 and 77.72

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Solution

The fourth proportional to 120.97, 181.50 and 77.72 is: 116.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.97 : 181.50 = 77.72 : x
  2. Step 2: Convert to fraction form
    120.97/181.50 = 77.72/x
  3. Step 3: Cross multiply
    120.97x = 181.50 × 77.72
  4. Step 4: Simplify right side
    120.97x = 14,105.76
  5. Step 5: Solve for x
    x = 14,105.76/120.97
  6. Step 6: Final answer
    x = 116.61

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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.