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Finding the Fourth Proportional to 208.61, 287.89 and 115.37

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Solution

The fourth proportional to 208.61, 287.89 and 115.37 is: 159.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.61 : 287.89 = 115.37 : x
  2. Step 2: Convert to fraction form
    208.61/287.89 = 115.37/x
  3. Step 3: Cross multiply
    208.61x = 287.89 × 115.37
  4. Step 4: Simplify right side
    208.61x = 33,215.33
  5. Step 5: Solve for x
    x = 33,215.33/208.61
  6. Step 6: Final answer
    x = 159.22

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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.