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Finding the Fourth Proportional to 409.11, 613.12 and 189.70

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Solution

The fourth proportional to 409.11, 613.12 and 189.70 is: 284.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.11 : 613.12 = 189.70 : x
  2. Step 2: Convert to fraction form
    409.11/613.12 = 189.70/x
  3. Step 3: Cross multiply
    409.11x = 613.12 × 189.70
  4. Step 4: Simplify right side
    409.11x = 116,308.86
  5. Step 5: Solve for x
    x = 116,308.86/409.11
  6. Step 6: Final answer
    x = 284.30

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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.