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Finding the Fourth Proportional to 808.49, 1,115.11 and 513.85

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Solution

The fourth proportional to 808.49, 1,115.11 and 513.85 is: 708.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.49 : 1,115.11 = 513.85 : x
  2. Step 2: Convert to fraction form
    808.49/1,115.11 = 513.85/x
  3. Step 3: Cross multiply
    808.49x = 1,115.11 × 513.85
  4. Step 4: Simplify right side
    808.49x = 572,999.27
  5. Step 5: Solve for x
    x = 572,999.27/808.49
  6. Step 6: Final answer
    x = 708.73

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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.