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Finding the Fourth Proportional to 518.31, 715.31 and 285.44

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Solution

The fourth proportional to 518.31, 715.31 and 285.44 is: 393.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.31 : 715.31 = 285.44 : x
  2. Step 2: Convert to fraction form
    518.31/715.31 = 285.44/x
  3. Step 3: Cross multiply
    518.31x = 715.31 × 285.44
  4. Step 4: Simplify right side
    518.31x = 204,174.87
  5. Step 5: Solve for x
    x = 204,174.87/518.31
  6. Step 6: Final answer
    x = 393.92

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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.