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Finding the Fourth Proportional to 518.22, 714.18 and 439.28

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Solution

The fourth proportional to 518.22, 714.18 and 439.28 is: 605.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.22 : 714.18 = 439.28 : x
  2. Step 2: Convert to fraction form
    518.22/714.18 = 439.28/x
  3. Step 3: Cross multiply
    518.22x = 714.18 × 439.28
  4. Step 4: Simplify right side
    518.22x = 313,724.99
  5. Step 5: Solve for x
    x = 313,724.99/518.22
  6. Step 6: Final answer
    x = 605.40

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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.