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Finding the Fourth Proportional to 120.50, 180.79 and 69.08

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Solution

The fourth proportional to 120.50, 180.79 and 69.08 is: 103.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.50 : 180.79 = 69.08 : x
  2. Step 2: Convert to fraction form
    120.50/180.79 = 69.08/x
  3. Step 3: Cross multiply
    120.50x = 180.79 × 69.08
  4. Step 4: Simplify right side
    120.50x = 12,488.97
  5. Step 5: Solve for x
    x = 12,488.97/120.50
  6. Step 6: Final answer
    x = 103.64

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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.