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Finding the Fourth Proportional to 406.69, 561.20 and 229.62

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Solution

The fourth proportional to 406.69, 561.20 and 229.62 is: 316.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.69 : 561.20 = 229.62 : x
  2. Step 2: Convert to fraction form
    406.69/561.20 = 229.62/x
  3. Step 3: Cross multiply
    406.69x = 561.20 × 229.62
  4. Step 4: Simplify right side
    406.69x = 128,863.70
  5. Step 5: Solve for x
    x = 128,863.70/406.69
  6. Step 6: Final answer
    x = 316.86

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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.