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Finding the Fourth Proportional to 606.12, 836.34 and 399

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Solution

The fourth proportional to 606.12, 836.34 and 399 is: 550.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.12 : 836.34 = 399 : x
  2. Step 2: Convert to fraction form
    606.12/836.34 = 399/x
  3. Step 3: Cross multiply
    606.12x = 836.34 × 399
  4. Step 4: Simplify right side
    606.12x = 333,699.66
  5. Step 5: Solve for x
    x = 333,699.66/606.12
  6. Step 6: Final answer
    x = 550.55

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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.