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Finding the Fourth Proportional to 872.37, 1,308.87 and 385.76

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Solution

The fourth proportional to 872.37, 1,308.87 and 385.76 is: 578.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.37 : 1,308.87 = 385.76 : x
  2. Step 2: Convert to fraction form
    872.37/1,308.87 = 385.76/x
  3. Step 3: Cross multiply
    872.37x = 1,308.87 × 385.76
  4. Step 4: Simplify right side
    872.37x = 504,912.96
  5. Step 5: Solve for x
    x = 504,912.96/872.37
  6. Step 6: Final answer
    x = 578.78

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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.