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Finding the Fourth Proportional to 199.19, 298.80 and 69.18

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Solution

The fourth proportional to 199.19, 298.80 and 69.18 is: 103.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.19 : 298.80 = 69.18 : x
  2. Step 2: Convert to fraction form
    199.19/298.80 = 69.18/x
  3. Step 3: Cross multiply
    199.19x = 298.80 × 69.18
  4. Step 4: Simplify right side
    199.19x = 20,670.98
  5. Step 5: Solve for x
    x = 20,670.98/199.19
  6. Step 6: Final answer
    x = 103.78

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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.