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Finding the Fourth Proportional to 518.69, 715.88 and 308.88

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Solution

The fourth proportional to 518.69, 715.88 and 308.88 is: 426.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.69 : 715.88 = 308.88 : x
  2. Step 2: Convert to fraction form
    518.69/715.88 = 308.88/x
  3. Step 3: Cross multiply
    518.69x = 715.88 × 308.88
  4. Step 4: Simplify right side
    518.69x = 221,121.01
  5. Step 5: Solve for x
    x = 221,121.01/518.69
  6. Step 6: Final answer
    x = 426.31

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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.