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Finding the Fourth Proportional to 208.33, 287.49 and 115.07

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Solution

The fourth proportional to 208.33, 287.49 and 115.07 is: 158.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.33 : 287.49 = 115.07 : x
  2. Step 2: Convert to fraction form
    208.33/287.49 = 115.07/x
  3. Step 3: Cross multiply
    208.33x = 287.49 × 115.07
  4. Step 4: Simplify right side
    208.33x = 33,080.95
  5. Step 5: Solve for x
    x = 33,080.95/208.33
  6. Step 6: Final answer
    x = 158.79

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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.