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Finding the Fourth Proportional to 439.12, 605.66 and 306.34

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Solution

The fourth proportional to 439.12, 605.66 and 306.34 is: 422.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.12 : 605.66 = 306.34 : x
  2. Step 2: Convert to fraction form
    439.12/605.66 = 306.34/x
  3. Step 3: Cross multiply
    439.12x = 605.66 × 306.34
  4. Step 4: Simplify right side
    439.12x = 185,537.88
  5. Step 5: Solve for x
    x = 185,537.88/439.12
  6. Step 6: Final answer
    x = 422.52

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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.