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Finding the Fourth Proportional to 518.61, 715.69 and 285.73

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Solution

The fourth proportional to 518.61, 715.69 and 285.73 is: 394.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.61 : 715.69 = 285.73 : x
  2. Step 2: Convert to fraction form
    518.61/715.69 = 285.73/x
  3. Step 3: Cross multiply
    518.61x = 715.69 × 285.73
  4. Step 4: Simplify right side
    518.61x = 204,494.10
  5. Step 5: Solve for x
    x = 204,494.10/518.61
  6. Step 6: Final answer
    x = 394.31

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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.