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Finding the Fourth Proportional to 506.72, 699.28 and 285.65

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Solution

The fourth proportional to 506.72, 699.28 and 285.65 is: 394.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.72 : 699.28 = 285.65 : x
  2. Step 2: Convert to fraction form
    506.72/699.28 = 285.65/x
  3. Step 3: Cross multiply
    506.72x = 699.28 × 285.65
  4. Step 4: Simplify right side
    506.72x = 199,749.33
  5. Step 5: Solve for x
    x = 199,749.33/506.72
  6. Step 6: Final answer
    x = 394.20

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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.