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Finding the Fourth Proportional to 506.90, 699.42 and 285.82

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Solution

The fourth proportional to 506.90, 699.42 and 285.82 is: 394.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.90 : 699.42 = 285.82 : x
  2. Step 2: Convert to fraction form
    506.90/699.42 = 285.82/x
  3. Step 3: Cross multiply
    506.90x = 699.42 × 285.82
  4. Step 4: Simplify right side
    506.90x = 199,906.48
  5. Step 5: Solve for x
    x = 199,906.48/506.90
  6. Step 6: Final answer
    x = 394.37

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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.