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Finding the Fourth Proportional to 217.45, 299.99 and 189.82

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Solution

The fourth proportional to 217.45, 299.99 and 189.82 is: 261.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.45 : 299.99 = 189.82 : x
  2. Step 2: Convert to fraction form
    217.45/299.99 = 189.82/x
  3. Step 3: Cross multiply
    217.45x = 299.99 × 189.82
  4. Step 4: Simplify right side
    217.45x = 56,943.83
  5. Step 5: Solve for x
    x = 56,943.83/217.45
  6. Step 6: Final answer
    x = 261.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.