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Finding the Fourth Proportional to 120.65, 179.79 and 114.85

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Solution

The fourth proportional to 120.65, 179.79 and 114.85 is: 171.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.65 : 179.79 = 114.85 : x
  2. Step 2: Convert to fraction form
    120.65/179.79 = 114.85/x
  3. Step 3: Cross multiply
    120.65x = 179.79 × 114.85
  4. Step 4: Simplify right side
    120.65x = 20,647.98
  5. Step 5: Solve for x
    x = 20,647.98/120.65
  6. Step 6: Final answer
    x = 171.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.