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Finding the Fourth Proportional to 439.52, 605.28 and 390.08

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Solution

The fourth proportional to 439.52, 605.28 and 390.08 is: 537.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.52 : 605.28 = 390.08 : x
  2. Step 2: Convert to fraction form
    439.52/605.28 = 390.08/x
  3. Step 3: Cross multiply
    439.52x = 605.28 × 390.08
  4. Step 4: Simplify right side
    439.52x = 236,107.62
  5. Step 5: Solve for x
    x = 236,107.62/439.52
  6. Step 6: Final answer
    x = 537.19

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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.