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Finding the Fourth Proportional to 207.80, 286.77 and 118.09

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Solution

The fourth proportional to 207.80, 286.77 and 118.09 is: 162.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.80 : 286.77 = 118.09 : x
  2. Step 2: Convert to fraction form
    207.80/286.77 = 118.09/x
  3. Step 3: Cross multiply
    207.80x = 286.77 × 118.09
  4. Step 4: Simplify right side
    207.80x = 33,865.08
  5. Step 5: Solve for x
    x = 33,865.08/207.80
  6. Step 6: Final answer
    x = 162.97

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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.