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Finding the Fourth Proportional to 721.63, 1,083.42 and 375.22

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Solution

The fourth proportional to 721.63, 1,083.42 and 375.22 is: 563.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.63 : 1,083.42 = 375.22 : x
  2. Step 2: Convert to fraction form
    721.63/1,083.42 = 375.22/x
  3. Step 3: Cross multiply
    721.63x = 1,083.42 × 375.22
  4. Step 4: Simplify right side
    721.63x = 406,520.85
  5. Step 5: Solve for x
    x = 406,520.85/721.63
  6. Step 6: Final answer
    x = 563.34

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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.