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Finding the Fourth Proportional to 216.12, 321.86 and 206.76

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Solution

The fourth proportional to 216.12, 321.86 and 206.76 is: 307.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.12 : 321.86 = 206.76 : x
  2. Step 2: Convert to fraction form
    216.12/321.86 = 206.76/x
  3. Step 3: Cross multiply
    216.12x = 321.86 × 206.76
  4. Step 4: Simplify right side
    216.12x = 66,546.74
  5. Step 5: Solve for x
    x = 66,546.74/216.12
  6. Step 6: Final answer
    x = 307.92

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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.