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Finding the Fourth Proportional to 872.34, 1,203.78 and 479.32

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Solution

The fourth proportional to 872.34, 1,203.78 and 479.32 is: 661.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.34 : 1,203.78 = 479.32 : x
  2. Step 2: Convert to fraction form
    872.34/1,203.78 = 479.32/x
  3. Step 3: Cross multiply
    872.34x = 1,203.78 × 479.32
  4. Step 4: Simplify right side
    872.34x = 576,995.83
  5. Step 5: Solve for x
    x = 576,995.83/872.34
  6. Step 6: Final answer
    x = 661.43

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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.