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Finding the Fourth Proportional to 217.75, 300.19 and 155.48

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Solution

The fourth proportional to 217.75, 300.19 and 155.48 is: 214.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.75 : 300.19 = 155.48 : x
  2. Step 2: Convert to fraction form
    217.75/300.19 = 155.48/x
  3. Step 3: Cross multiply
    217.75x = 300.19 × 155.48
  4. Step 4: Simplify right side
    217.75x = 46,673.63
  5. Step 5: Solve for x
    x = 46,673.63/217.75
  6. Step 6: Final answer
    x = 214.35

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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.