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Finding the Fourth Proportional to 203.65, 280.90 and 120.69

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Solution

The fourth proportional to 203.65, 280.90 and 120.69 is: 166.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.65 : 280.90 = 120.69 : x
  2. Step 2: Convert to fraction form
    203.65/280.90 = 120.69/x
  3. Step 3: Cross multiply
    203.65x = 280.90 × 120.69
  4. Step 4: Simplify right side
    203.65x = 33,901.97
  5. Step 5: Solve for x
    x = 33,901.97/203.65
  6. Step 6: Final answer
    x = 166.47

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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.