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Finding the Fourth Proportional to 217.94, 329.40 and 215.51

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Solution

The fourth proportional to 217.94, 329.40 and 215.51 is: 325.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.94 : 329.40 = 215.51 : x
  2. Step 2: Convert to fraction form
    217.94/329.40 = 215.51/x
  3. Step 3: Cross multiply
    217.94x = 329.40 × 215.51
  4. Step 4: Simplify right side
    217.94x = 70,987.35
  5. Step 5: Solve for x
    x = 70,987.35/217.94
  6. Step 6: Final answer
    x = 325.73

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.