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Finding the Fourth Proportional to 872.26, 1,203.69 and 522.70

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Solution

The fourth proportional to 872.26, 1,203.69 and 522.70 is: 721.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.26 : 1,203.69 = 522.70 : x
  2. Step 2: Convert to fraction form
    872.26/1,203.69 = 522.70/x
  3. Step 3: Cross multiply
    872.26x = 1,203.69 × 522.70
  4. Step 4: Simplify right side
    872.26x = 629,168.76
  5. Step 5: Solve for x
    x = 629,168.76/872.26
  6. Step 6: Final answer
    x = 721.31

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Double scale
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1.5x scale

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.