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Finding the Fourth Proportional to 216.72, 323.20 and 205.98

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Solution

The fourth proportional to 216.72, 323.20 and 205.98 is: 307.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.72 : 323.20 = 205.98 : x
  2. Step 2: Convert to fraction form
    216.72/323.20 = 205.98/x
  3. Step 3: Cross multiply
    216.72x = 323.20 × 205.98
  4. Step 4: Simplify right side
    216.72x = 66,572.74
  5. Step 5: Solve for x
    x = 66,572.74/216.72
  6. Step 6: Final answer
    x = 307.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.