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Finding the Fourth Proportional to 872.39, 1,203.87 and 479.40

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Solution

The fourth proportional to 872.39, 1,203.87 and 479.40 is: 661.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.39 : 1,203.87 = 479.40 : x
  2. Step 2: Convert to fraction form
    872.39/1,203.87 = 479.40/x
  3. Step 3: Cross multiply
    872.39x = 1,203.87 × 479.40
  4. Step 4: Simplify right side
    872.39x = 577,135.28
  5. Step 5: Solve for x
    x = 577,135.28/872.39
  6. Step 6: Final answer
    x = 661.56

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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.