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Finding the Fourth Proportional to 518.39, 715.36 and 308.56

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Solution

The fourth proportional to 518.39, 715.36 and 308.56 is: 425.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.39 : 715.36 = 308.56 : x
  2. Step 2: Convert to fraction form
    518.39/715.36 = 308.56/x
  3. Step 3: Cross multiply
    518.39x = 715.36 × 308.56
  4. Step 4: Simplify right side
    518.39x = 220,731.48
  5. Step 5: Solve for x
    x = 220,731.48/518.39
  6. Step 6: Final answer
    x = 425.80

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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.