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Finding the Fourth Proportional to 209.12, 288.28 and 173.72

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Solution

The fourth proportional to 209.12, 288.28 and 173.72 is: 239.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.12 : 288.28 = 173.72 : x
  2. Step 2: Convert to fraction form
    209.12/288.28 = 173.72/x
  3. Step 3: Cross multiply
    209.12x = 288.28 × 173.72
  4. Step 4: Simplify right side
    209.12x = 50,080.00
  5. Step 5: Solve for x
    x = 50,080.00/209.12
  6. Step 6: Final answer
    x = 239.48

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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.