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Finding the Fourth Proportional to 872.90, 1,204.68 and 479.96

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Solution

The fourth proportional to 872.90, 1,204.68 and 479.96 is: 662.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.90 : 1,204.68 = 479.96 : x
  2. Step 2: Convert to fraction form
    872.90/1,204.68 = 479.96/x
  3. Step 3: Cross multiply
    872.90x = 1,204.68 × 479.96
  4. Step 4: Simplify right side
    872.90x = 578,198.21
  5. Step 5: Solve for x
    x = 578,198.21/872.90
  6. Step 6: Final answer
    x = 662.39

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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.