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Finding the Fourth Proportional to 439.20, 603.38 and 393.19

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Solution

The fourth proportional to 439.20, 603.38 and 393.19 is: 540.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.20 : 603.38 = 393.19 : x
  2. Step 2: Convert to fraction form
    439.20/603.38 = 393.19/x
  3. Step 3: Cross multiply
    439.20x = 603.38 × 393.19
  4. Step 4: Simplify right side
    439.20x = 237,242.46
  5. Step 5: Solve for x
    x = 237,242.46/439.20
  6. Step 6: Final answer
    x = 540.17

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.