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Finding the Fourth Proportional to 209.53, 288.88 and 143.92

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Solution

The fourth proportional to 209.53, 288.88 and 143.92 is: 198.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.53 : 288.88 = 143.92 : x
  2. Step 2: Convert to fraction form
    209.53/288.88 = 143.92/x
  3. Step 3: Cross multiply
    209.53x = 288.88 × 143.92
  4. Step 4: Simplify right side
    209.53x = 41,573.45
  5. Step 5: Solve for x
    x = 41,573.45/209.53
  6. Step 6: Final answer
    x = 198.42

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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.