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Finding the Fourth Proportional to 878.88, 1,213.42 and 547.34

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Solution

The fourth proportional to 878.88, 1,213.42 and 547.34 is: 755.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.88 : 1,213.42 = 547.34 : x
  2. Step 2: Convert to fraction form
    878.88/1,213.42 = 547.34/x
  3. Step 3: Cross multiply
    878.88x = 1,213.42 × 547.34
  4. Step 4: Simplify right side
    878.88x = 664,153.30
  5. Step 5: Solve for x
    x = 664,153.30/878.88
  6. Step 6: Final answer
    x = 755.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.