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Finding the Fourth Proportional to 207.92, 286.45 and 161.13

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Solution

The fourth proportional to 207.92, 286.45 and 161.13 is: 221.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.92 : 286.45 = 161.13 : x
  2. Step 2: Convert to fraction form
    207.92/286.45 = 161.13/x
  3. Step 3: Cross multiply
    207.92x = 286.45 × 161.13
  4. Step 4: Simplify right side
    207.92x = 46,155.69
  5. Step 5: Solve for x
    x = 46,155.69/207.92
  6. Step 6: Final answer
    x = 221.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.