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Finding the Fourth Proportional to 807.21, 1,211.10 and 396.30

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Solution

The fourth proportional to 807.21, 1,211.10 and 396.30 is: 594.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.21 : 1,211.10 = 396.30 : x
  2. Step 2: Convert to fraction form
    807.21/1,211.10 = 396.30/x
  3. Step 3: Cross multiply
    807.21x = 1,211.10 × 396.30
  4. Step 4: Simplify right side
    807.21x = 479,958.93
  5. Step 5: Solve for x
    x = 479,958.93/807.21
  6. Step 6: Final answer
    x = 594.59

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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.