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Finding the Fourth Proportional to 872.56, 1,309.18 and 385.27

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Solution

The fourth proportional to 872.56, 1,309.18 and 385.27 is: 578.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.56 : 1,309.18 = 385.27 : x
  2. Step 2: Convert to fraction form
    872.56/1,309.18 = 385.27/x
  3. Step 3: Cross multiply
    872.56x = 1,309.18 × 385.27
  4. Step 4: Simplify right side
    872.56x = 504,379.31
  5. Step 5: Solve for x
    x = 504,379.31/872.56
  6. Step 6: Final answer
    x = 578.05

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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.