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Finding the Fourth Proportional to 209.28, 288.56 and 172.53

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Solution

The fourth proportional to 209.28, 288.56 and 172.53 is: 237.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.28 : 288.56 = 172.53 : x
  2. Step 2: Convert to fraction form
    209.28/288.56 = 172.53/x
  3. Step 3: Cross multiply
    209.28x = 288.56 × 172.53
  4. Step 4: Simplify right side
    209.28x = 49,785.69
  5. Step 5: Solve for x
    x = 49,785.69/209.28
  6. Step 6: Final answer
    x = 237.89

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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.