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Finding the Fourth Proportional to 208.26, 287.16 and 142.74

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Solution

The fourth proportional to 208.26, 287.16 and 142.74 is: 196.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.26 : 287.16 = 142.74 : x
  2. Step 2: Convert to fraction form
    208.26/287.16 = 142.74/x
  3. Step 3: Cross multiply
    208.26x = 287.16 × 142.74
  4. Step 4: Simplify right side
    208.26x = 40,989.22
  5. Step 5: Solve for x
    x = 40,989.22/208.26
  6. Step 6: Final answer
    x = 196.82

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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.