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Finding the Fourth Proportional to 208.43, 287.61 and 115.17

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Solution

The fourth proportional to 208.43, 287.61 and 115.17 is: 158.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.43 : 287.61 = 115.17 : x
  2. Step 2: Convert to fraction form
    208.43/287.61 = 115.17/x
  3. Step 3: Cross multiply
    208.43x = 287.61 × 115.17
  4. Step 4: Simplify right side
    208.43x = 33,122.53
  5. Step 5: Solve for x
    x = 33,122.53/208.43
  6. Step 6: Final answer
    x = 158.91

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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.