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Finding the Fourth Proportional to 872.22, 1,308.45 and 385.26

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Solution

The fourth proportional to 872.22, 1,308.45 and 385.26 is: 577.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.22 : 1,308.45 = 385.26 : x
  2. Step 2: Convert to fraction form
    872.22/1,308.45 = 385.26/x
  3. Step 3: Cross multiply
    872.22x = 1,308.45 × 385.26
  4. Step 4: Simplify right side
    872.22x = 504,093.45
  5. Step 5: Solve for x
    x = 504,093.45/872.22
  6. Step 6: Final answer
    x = 577.94

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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.