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Finding the Fourth Proportional to 872.32, 1,203.29 and 522.80

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Solution

The fourth proportional to 872.32, 1,203.29 and 522.80 is: 721.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.32 : 1,203.29 = 522.80 : x
  2. Step 2: Convert to fraction form
    872.32/1,203.29 = 522.80/x
  3. Step 3: Cross multiply
    872.32x = 1,203.29 × 522.80
  4. Step 4: Simplify right side
    872.32x = 629,080.01
  5. Step 5: Solve for x
    x = 629,080.01/872.32
  6. Step 6: Final answer
    x = 721.16

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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.