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Finding the Fourth Proportional to 207.90, 286.81 and 120.55

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Solution

The fourth proportional to 207.90, 286.81 and 120.55 is: 166.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.90 : 286.81 = 120.55 : x
  2. Step 2: Convert to fraction form
    207.90/286.81 = 120.55/x
  3. Step 3: Cross multiply
    207.90x = 286.81 × 120.55
  4. Step 4: Simplify right side
    207.90x = 34,574.95
  5. Step 5: Solve for x
    x = 34,574.95/207.90
  6. Step 6: Final answer
    x = 166.31

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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.