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Finding the Fourth Proportional to 808.65, 1,115.51 and 611.82

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Solution

The fourth proportional to 808.65, 1,115.51 and 611.82 is: 843.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.65 : 1,115.51 = 611.82 : x
  2. Step 2: Convert to fraction form
    808.65/1,115.51 = 611.82/x
  3. Step 3: Cross multiply
    808.65x = 1,115.51 × 611.82
  4. Step 4: Simplify right side
    808.65x = 682,487.53
  5. Step 5: Solve for x
    x = 682,487.53/808.65
  6. Step 6: Final answer
    x = 843.99

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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.