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Finding the Fourth Proportional to 606.62, 911.79 and 391.57

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Solution

The fourth proportional to 606.62, 911.79 and 391.57 is: 588.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.62 : 911.79 = 391.57 : x
  2. Step 2: Convert to fraction form
    606.62/911.79 = 391.57/x
  3. Step 3: Cross multiply
    606.62x = 911.79 × 391.57
  4. Step 4: Simplify right side
    606.62x = 357,027.33
  5. Step 5: Solve for x
    x = 357,027.33/606.62
  6. Step 6: Final answer
    x = 588.55

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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.