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Finding the Fourth Proportional to 208.09, 287.00 and 142.58

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Solution

The fourth proportional to 208.09, 287.00 and 142.58 is: 196.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.09 : 287.00 = 142.58 : x
  2. Step 2: Convert to fraction form
    208.09/287.00 = 142.58/x
  3. Step 3: Cross multiply
    208.09x = 287.00 × 142.58
  4. Step 4: Simplify right side
    208.09x = 40,919.75
  5. Step 5: Solve for x
    x = 40,919.75/208.09
  6. Step 6: Final answer
    x = 196.65

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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.