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Finding the Fourth Proportional to 209.99, 289.92 and 160.78

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Solution

The fourth proportional to 209.99, 289.92 and 160.78 is: 221.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.99 : 289.92 = 160.78 : x
  2. Step 2: Convert to fraction form
    209.99/289.92 = 160.78/x
  3. Step 3: Cross multiply
    209.99x = 289.92 × 160.78
  4. Step 4: Simplify right side
    209.99x = 46,613.22
  5. Step 5: Solve for x
    x = 46,613.22/209.99
  6. Step 6: Final answer
    x = 221.98

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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.