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Finding the Fourth Proportional to 872.21, 1,203.41 and 518.13

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Solution

The fourth proportional to 872.21, 1,203.41 and 518.13 is: 714.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.21 : 1,203.41 = 518.13 : x
  2. Step 2: Convert to fraction form
    872.21/1,203.41 = 518.13/x
  3. Step 3: Cross multiply
    872.21x = 1,203.41 × 518.13
  4. Step 4: Simplify right side
    872.21x = 623,520.23
  5. Step 5: Solve for x
    x = 623,520.23/872.21
  6. Step 6: Final answer
    x = 714.88

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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.