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Finding the Fourth Proportional to 439.64, 605.56 and 306.62

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Solution

The fourth proportional to 439.64, 605.56 and 306.62 is: 422.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.64 : 605.56 = 306.62 : x
  2. Step 2: Convert to fraction form
    439.64/605.56 = 306.62/x
  3. Step 3: Cross multiply
    439.64x = 605.56 × 306.62
  4. Step 4: Simplify right side
    439.64x = 185,676.81
  5. Step 5: Solve for x
    x = 185,676.81/439.64
  6. Step 6: Final answer
    x = 422.34

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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.