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Finding the Fourth Proportional to 518.68, 715.72 and 308.88

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Solution

The fourth proportional to 518.68, 715.72 and 308.88 is: 426.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.68 : 715.72 = 308.88 : x
  2. Step 2: Convert to fraction form
    518.68/715.72 = 308.88/x
  3. Step 3: Cross multiply
    518.68x = 715.72 × 308.88
  4. Step 4: Simplify right side
    518.68x = 221,071.59
  5. Step 5: Solve for x
    x = 221,071.59/518.68
  6. Step 6: Final answer
    x = 426.22

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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.