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Finding the Fourth Proportional to 507.00, 699.31 and 310.61

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Solution

The fourth proportional to 507.00, 699.31 and 310.61 is: 428.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.00 : 699.31 = 310.61 : x
  2. Step 2: Convert to fraction form
    507.00/699.31 = 310.61/x
  3. Step 3: Cross multiply
    507.00x = 699.31 × 310.61
  4. Step 4: Simplify right side
    507.00x = 217,211.90
  5. Step 5: Solve for x
    x = 217,211.90/507.00
  6. Step 6: Final answer
    x = 428.42

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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.