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Finding the Fourth Proportional to 456.41, 629.09 and 439.40

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Solution

The fourth proportional to 456.41, 629.09 and 439.40 is: 605.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.41 : 629.09 = 439.40 : x
  2. Step 2: Convert to fraction form
    456.41/629.09 = 439.40/x
  3. Step 3: Cross multiply
    456.41x = 629.09 × 439.40
  4. Step 4: Simplify right side
    456.41x = 276,422.15
  5. Step 5: Solve for x
    x = 276,422.15/456.41
  6. Step 6: Final answer
    x = 605.64

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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.