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Finding the Fourth Proportional to 287.97, 431.60 and 143.73

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Solution

The fourth proportional to 287.97, 431.60 and 143.73 is: 215.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.97 : 431.60 = 143.73 : x
  2. Step 2: Convert to fraction form
    287.97/431.60 = 143.73/x
  3. Step 3: Cross multiply
    287.97x = 431.60 × 143.73
  4. Step 4: Simplify right side
    287.97x = 62,033.15
  5. Step 5: Solve for x
    x = 62,033.15/287.97
  6. Step 6: Final answer
    x = 215.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.