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Finding the Fourth Proportional to 518.65, 714.09 and 439.79

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Solution

The fourth proportional to 518.65, 714.09 and 439.79 is: 605.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.65 : 714.09 = 439.79 : x
  2. Step 2: Convert to fraction form
    518.65/714.09 = 439.79/x
  3. Step 3: Cross multiply
    518.65x = 714.09 × 439.79
  4. Step 4: Simplify right side
    518.65x = 314,049.64
  5. Step 5: Solve for x
    x = 314,049.64/518.65
  6. Step 6: Final answer
    x = 605.51

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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.