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Finding the Fourth Proportional to 606.20, 908.10 and 389

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Solution

The fourth proportional to 606.20, 908.10 and 389 is: 582.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.20 : 908.10 = 389 : x
  2. Step 2: Convert to fraction form
    606.20/908.10 = 389/x
  3. Step 3: Cross multiply
    606.20x = 908.10 × 389
  4. Step 4: Simplify right side
    606.20x = 353,250.90
  5. Step 5: Solve for x
    x = 353,250.90/606.20
  6. Step 6: Final answer
    x = 582.73

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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.