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Finding the Fourth Proportional to 217.50, 300.15 and 125.50

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Solution

The fourth proportional to 217.50, 300.15 and 125.50 is: 173.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.50 : 300.15 = 125.50 : x
  2. Step 2: Convert to fraction form
    217.50/300.15 = 125.50/x
  3. Step 3: Cross multiply
    217.50x = 300.15 × 125.50
  4. Step 4: Simplify right side
    217.50x = 37,668.83
  5. Step 5: Solve for x
    x = 37,668.83/217.50
  6. Step 6: Final answer
    x = 173.19

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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.