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Finding the Fourth Proportional to 506.79, 699.30 and 285.71

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Solution

The fourth proportional to 506.79, 699.30 and 285.71 is: 394.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.79 : 699.30 = 285.71 : x
  2. Step 2: Convert to fraction form
    506.79/699.30 = 285.71/x
  3. Step 3: Cross multiply
    506.79x = 699.30 × 285.71
  4. Step 4: Simplify right side
    506.79x = 199,793.51
  5. Step 5: Solve for x
    x = 199,793.51/506.79
  6. Step 6: Final answer
    x = 394.23

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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.