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Finding the Fourth Proportional to 217.49, 299.90 and 170.91

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Solution

The fourth proportional to 217.49, 299.90 and 170.91 is: 235.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.49 : 299.90 = 170.91 : x
  2. Step 2: Convert to fraction form
    217.49/299.90 = 170.91/x
  3. Step 3: Cross multiply
    217.49x = 299.90 × 170.91
  4. Step 4: Simplify right side
    217.49x = 51,256.34
  5. Step 5: Solve for x
    x = 51,256.34/217.49
  6. Step 6: Final answer
    x = 235.68

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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.