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Finding the Fourth Proportional to 809.60, 1,213.78 and 376.44

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Solution

The fourth proportional to 809.60, 1,213.78 and 376.44 is: 564.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.60 : 1,213.78 = 376.44 : x
  2. Step 2: Convert to fraction form
    809.60/1,213.78 = 376.44/x
  3. Step 3: Cross multiply
    809.60x = 1,213.78 × 376.44
  4. Step 4: Simplify right side
    809.60x = 456,915.34
  5. Step 5: Solve for x
    x = 456,915.34/809.60
  6. Step 6: Final answer
    x = 564.37

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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.