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Finding the Fourth Proportional to 209.21, 288.33 and 159.99

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Solution

The fourth proportional to 209.21, 288.33 and 159.99 is: 220.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.21 : 288.33 = 159.99 : x
  2. Step 2: Convert to fraction form
    209.21/288.33 = 159.99/x
  3. Step 3: Cross multiply
    209.21x = 288.33 × 159.99
  4. Step 4: Simplify right side
    209.21x = 46,129.92
  5. Step 5: Solve for x
    x = 46,129.92/209.21
  6. Step 6: Final answer
    x = 220.50

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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.