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Finding the Fourth Proportional to 807.90, 1,212.21 and 397.44

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Solution

The fourth proportional to 807.90, 1,212.21 and 397.44 is: 596.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.90 : 1,212.21 = 397.44 : x
  2. Step 2: Convert to fraction form
    807.90/1,212.21 = 397.44/x
  3. Step 3: Cross multiply
    807.90x = 1,212.21 × 397.44
  4. Step 4: Simplify right side
    807.90x = 481,772.69
  5. Step 5: Solve for x
    x = 481,772.69/807.90
  6. Step 6: Final answer
    x = 596.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.