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Finding the Fourth Proportional to 872.55, 1,309.43 and 385.94

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Solution

The fourth proportional to 872.55, 1,309.43 and 385.94 is: 579.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.55 : 1,309.43 = 385.94 : x
  2. Step 2: Convert to fraction form
    872.55/1,309.43 = 385.94/x
  3. Step 3: Cross multiply
    872.55x = 1,309.43 × 385.94
  4. Step 4: Simplify right side
    872.55x = 505,365.65
  5. Step 5: Solve for x
    x = 505,365.65/872.55
  6. Step 6: Final answer
    x = 579.18

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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.