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Finding the Fourth Proportional to 439.16, 605.78 and 356.33

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Solution

The fourth proportional to 439.16, 605.78 and 356.33 is: 491.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.16 : 605.78 = 356.33 : x
  2. Step 2: Convert to fraction form
    439.16/605.78 = 356.33/x
  3. Step 3: Cross multiply
    439.16x = 605.78 × 356.33
  4. Step 4: Simplify right side
    439.16x = 215,858.66
  5. Step 5: Solve for x
    x = 215,858.66/439.16
  6. Step 6: Final answer
    x = 491.53

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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.