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Finding the Fourth Proportional to 506.71, 699.29 and 310.20

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Solution

The fourth proportional to 506.71, 699.29 and 310.20 is: 428.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.71 : 699.29 = 310.20 : x
  2. Step 2: Convert to fraction form
    506.71/699.29 = 310.20/x
  3. Step 3: Cross multiply
    506.71x = 699.29 × 310.20
  4. Step 4: Simplify right side
    506.71x = 216,919.76
  5. Step 5: Solve for x
    x = 216,919.76/506.71
  6. Step 6: Final answer
    x = 428.09

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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.