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Finding the Fourth Proportional to 211.92, 316.27 and 206.45

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Solution

The fourth proportional to 211.92, 316.27 and 206.45 is: 308.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.92 : 316.27 = 206.45 : x
  2. Step 2: Convert to fraction form
    211.92/316.27 = 206.45/x
  3. Step 3: Cross multiply
    211.92x = 316.27 × 206.45
  4. Step 4: Simplify right side
    211.92x = 65,292.93
  5. Step 5: Solve for x
    x = 65,292.93/211.92
  6. Step 6: Final answer
    x = 308.11

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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.