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Finding the Fourth Proportional to 209.99, 315 and 88.22

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Solution

The fourth proportional to 209.99, 315 and 88.22 is: 132.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.99 : 315 = 88.22 : x
  2. Step 2: Convert to fraction form
    209.99/315 = 88.22/x
  3. Step 3: Cross multiply
    209.99x = 315 × 88.22
  4. Step 4: Simplify right side
    209.99x = 27,790.09
  5. Step 5: Solve for x
    x = 27,790.09/209.99
  6. Step 6: Final answer
    x = 132.34

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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.