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Finding the Fourth Proportional to 506.99, 699.72 and 310.61

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Solution

The fourth proportional to 506.99, 699.72 and 310.61 is: 428.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.99 : 699.72 = 310.61 : x
  2. Step 2: Convert to fraction form
    506.99/699.72 = 310.61/x
  3. Step 3: Cross multiply
    506.99x = 699.72 × 310.61
  4. Step 4: Simplify right side
    506.99x = 217,340.03
  5. Step 5: Solve for x
    x = 217,340.03/506.99
  6. Step 6: Final answer
    x = 428.69

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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.