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Finding the Fourth Proportional to 216.47, 324.91 and 209.18

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Solution

The fourth proportional to 216.47, 324.91 and 209.18 is: 313.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.47 : 324.91 = 209.18 : x
  2. Step 2: Convert to fraction form
    216.47/324.91 = 209.18/x
  3. Step 3: Cross multiply
    216.47x = 324.91 × 209.18
  4. Step 4: Simplify right side
    216.47x = 67,965.75
  5. Step 5: Solve for x
    x = 67,965.75/216.47
  6. Step 6: Final answer
    x = 313.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.