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Finding the Fourth Proportional to 874.78, 1,207.20 and 481.84

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Solution

The fourth proportional to 874.78, 1,207.20 and 481.84 is: 664.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.78 : 1,207.20 = 481.84 : x
  2. Step 2: Convert to fraction form
    874.78/1,207.20 = 481.84/x
  3. Step 3: Cross multiply
    874.78x = 1,207.20 × 481.84
  4. Step 4: Simplify right side
    874.78x = 581,677.25
  5. Step 5: Solve for x
    x = 581,677.25/874.78
  6. Step 6: Final answer
    x = 664.94

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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.