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Finding the Fourth Proportional to 872.20, 1,203.56 and 479.22

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Solution

The fourth proportional to 872.20, 1,203.56 and 479.22 is: 661.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.20 : 1,203.56 = 479.22 : x
  2. Step 2: Convert to fraction form
    872.20/1,203.56 = 479.22/x
  3. Step 3: Cross multiply
    872.20x = 1,203.56 × 479.22
  4. Step 4: Simplify right side
    872.20x = 576,770.02
  5. Step 5: Solve for x
    x = 576,770.02/872.20
  6. Step 6: Final answer
    x = 661.28

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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.