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Finding the Fourth Proportional to 208.44, 287.55 and 129.70

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Solution

The fourth proportional to 208.44, 287.55 and 129.70 is: 178.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.44 : 287.55 = 129.70 : x
  2. Step 2: Convert to fraction form
    208.44/287.55 = 129.70/x
  3. Step 3: Cross multiply
    208.44x = 287.55 × 129.70
  4. Step 4: Simplify right side
    208.44x = 37,295.59
  5. Step 5: Solve for x
    x = 37,295.59/208.44
  6. Step 6: Final answer
    x = 178.93

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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.