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Finding the Fourth Proportional to 217.97, 300.78 and 124.74

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Solution

The fourth proportional to 217.97, 300.78 and 124.74 is: 172.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.97 : 300.78 = 124.74 : x
  2. Step 2: Convert to fraction form
    217.97/300.78 = 124.74/x
  3. Step 3: Cross multiply
    217.97x = 300.78 × 124.74
  4. Step 4: Simplify right side
    217.97x = 37,519.30
  5. Step 5: Solve for x
    x = 37,519.30/217.97
  6. Step 6: Final answer
    x = 172.13

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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.