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Finding the Fourth Proportional to 506.78, 699.32 and 285.74

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Solution

The fourth proportional to 506.78, 699.32 and 285.74 is: 394.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.78 : 699.32 = 285.74 : x
  2. Step 2: Convert to fraction form
    506.78/699.32 = 285.74/x
  3. Step 3: Cross multiply
    506.78x = 699.32 × 285.74
  4. Step 4: Simplify right side
    506.78x = 199,823.70
  5. Step 5: Solve for x
    x = 199,823.70/506.78
  6. Step 6: Final answer
    x = 394.30

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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.