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Finding the Fourth Proportional to 217.49, 300.10 and 124.21

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Solution

The fourth proportional to 217.49, 300.10 and 124.21 is: 171.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.49 : 300.10 = 124.21 : x
  2. Step 2: Convert to fraction form
    217.49/300.10 = 124.21/x
  3. Step 3: Cross multiply
    217.49x = 300.10 × 124.21
  4. Step 4: Simplify right side
    217.49x = 37,273.92
  5. Step 5: Solve for x
    x = 37,273.92/217.49
  6. Step 6: Final answer
    x = 171.38

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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.