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Finding the Fourth Proportional to 606.85, 908.75 and 386.80

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Solution

The fourth proportional to 606.85, 908.75 and 386.80 is: 579.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.85 : 908.75 = 386.80 : x
  2. Step 2: Convert to fraction form
    606.85/908.75 = 386.80/x
  3. Step 3: Cross multiply
    606.85x = 908.75 × 386.80
  4. Step 4: Simplify right side
    606.85x = 351,503.20
  5. Step 5: Solve for x
    x = 351,503.20/606.85
  6. Step 6: Final answer
    x = 579.23

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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.