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Finding the Fourth Proportional to 811.37, 1,217.21 and 291.44

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Solution

The fourth proportional to 811.37, 1,217.21 and 291.44 is: 437.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.37 : 1,217.21 = 291.44 : x
  2. Step 2: Convert to fraction form
    811.37/1,217.21 = 291.44/x
  3. Step 3: Cross multiply
    811.37x = 1,217.21 × 291.44
  4. Step 4: Simplify right side
    811.37x = 354,736.14
  5. Step 5: Solve for x
    x = 354,736.14/811.37
  6. Step 6: Final answer
    x = 437.21

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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.