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Finding the Fourth Proportional to 872.14, 1,203.60 and 479.20

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Solution

The fourth proportional to 872.14, 1,203.60 and 479.20 is: 661.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.14 : 1,203.60 = 479.20 : x
  2. Step 2: Convert to fraction form
    872.14/1,203.60 = 479.20/x
  3. Step 3: Cross multiply
    872.14x = 1,203.60 × 479.20
  4. Step 4: Simplify right side
    872.14x = 576,765.12
  5. Step 5: Solve for x
    x = 576,765.12/872.14
  6. Step 6: Final answer
    x = 661.32

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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.