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Finding the Fourth Proportional to 199.17, 298.89 and 69.21

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Solution

The fourth proportional to 199.17, 298.89 and 69.21 is: 103.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.17 : 298.89 = 69.21 : x
  2. Step 2: Convert to fraction form
    199.17/298.89 = 69.21/x
  3. Step 3: Cross multiply
    199.17x = 298.89 × 69.21
  4. Step 4: Simplify right side
    199.17x = 20,686.18
  5. Step 5: Solve for x
    x = 20,686.18/199.17
  6. Step 6: Final answer
    x = 103.86

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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.