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Finding the Fourth Proportional to 208.11, 287.08 and 125.25

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Solution

The fourth proportional to 208.11, 287.08 and 125.25 is: 172.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.11 : 287.08 = 125.25 : x
  2. Step 2: Convert to fraction form
    208.11/287.08 = 125.25/x
  3. Step 3: Cross multiply
    208.11x = 287.08 × 125.25
  4. Step 4: Simplify right side
    208.11x = 35,956.77
  5. Step 5: Solve for x
    x = 35,956.77/208.11
  6. Step 6: Final answer
    x = 172.78

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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.