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Finding the Fourth Proportional to 879.08, 1,213.14 and 480.75

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Solution

The fourth proportional to 879.08, 1,213.14 and 480.75 is: 663.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.08 : 1,213.14 = 480.75 : x
  2. Step 2: Convert to fraction form
    879.08/1,213.14 = 480.75/x
  3. Step 3: Cross multiply
    879.08x = 1,213.14 × 480.75
  4. Step 4: Simplify right side
    879.08x = 583,213.88
  5. Step 5: Solve for x
    x = 583,213.88/879.08
  6. Step 6: Final answer
    x = 663.43

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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.