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Finding the Fourth Proportional to 208.59, 287.80 and 125.66

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Solution

The fourth proportional to 208.59, 287.80 and 125.66 is: 173.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.59 : 287.80 = 125.66 : x
  2. Step 2: Convert to fraction form
    208.59/287.80 = 125.66/x
  3. Step 3: Cross multiply
    208.59x = 287.80 × 125.66
  4. Step 4: Simplify right side
    208.59x = 36,164.95
  5. Step 5: Solve for x
    x = 36,164.95/208.59
  6. Step 6: Final answer
    x = 173.38

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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.