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Finding the Fourth Proportional to 217.86, 328.87 and 216.65

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Solution

The fourth proportional to 217.86, 328.87 and 216.65 is: 327.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.86 : 328.87 = 216.65 : x
  2. Step 2: Convert to fraction form
    217.86/328.87 = 216.65/x
  3. Step 3: Cross multiply
    217.86x = 328.87 × 216.65
  4. Step 4: Simplify right side
    217.86x = 71,248.04
  5. Step 5: Solve for x
    x = 71,248.04/217.86
  6. Step 6: Final answer
    x = 327.04

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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.