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Finding the Fourth Proportional to 872.81, 1,309.37 and 385.85

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Solution

The fourth proportional to 872.81, 1,309.37 and 385.85 is: 578.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.81 : 1,309.37 = 385.85 : x
  2. Step 2: Convert to fraction form
    872.81/1,309.37 = 385.85/x
  3. Step 3: Cross multiply
    872.81x = 1,309.37 × 385.85
  4. Step 4: Simplify right side
    872.81x = 505,211.94
  5. Step 5: Solve for x
    x = 505,211.94/872.81
  6. Step 6: Final answer
    x = 578.84

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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.