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Finding the Fourth Proportional to 208.43, 287.61 and 121.11

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Solution

The fourth proportional to 208.43, 287.61 and 121.11 is: 167.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.43 : 287.61 = 121.11 : x
  2. Step 2: Convert to fraction form
    208.43/287.61 = 121.11/x
  3. Step 3: Cross multiply
    208.43x = 287.61 × 121.11
  4. Step 4: Simplify right side
    208.43x = 34,832.45
  5. Step 5: Solve for x
    x = 34,832.45/208.43
  6. Step 6: Final answer
    x = 167.12

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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.