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Finding the Fourth Proportional to 872.36, 1,308.82 and 385.34

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Solution

The fourth proportional to 872.36, 1,308.82 and 385.34 is: 578.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.36 : 1,308.82 = 385.34 : x
  2. Step 2: Convert to fraction form
    872.36/1,308.82 = 385.34/x
  3. Step 3: Cross multiply
    872.36x = 1,308.82 × 385.34
  4. Step 4: Simplify right side
    872.36x = 504,340.70
  5. Step 5: Solve for x
    x = 504,340.70/872.36
  6. Step 6: Final answer
    x = 578.13

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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.