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Finding the Fourth Proportional to 209.97, 315.18 and 88.31

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Solution

The fourth proportional to 209.97, 315.18 and 88.31 is: 132.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.97 : 315.18 = 88.31 : x
  2. Step 2: Convert to fraction form
    209.97/315.18 = 88.31/x
  3. Step 3: Cross multiply
    209.97x = 315.18 × 88.31
  4. Step 4: Simplify right side
    209.97x = 27,834.33
  5. Step 5: Solve for x
    x = 27,834.33/209.97
  6. Step 6: Final answer
    x = 132.56

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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.