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Finding the Fourth Proportional to 879.21, 1,213.20 and 547.65

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Solution

The fourth proportional to 879.21, 1,213.20 and 547.65 is: 755.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.21 : 1,213.20 = 547.65 : x
  2. Step 2: Convert to fraction form
    879.21/1,213.20 = 547.65/x
  3. Step 3: Cross multiply
    879.21x = 1,213.20 × 547.65
  4. Step 4: Simplify right side
    879.21x = 664,408.98
  5. Step 5: Solve for x
    x = 664,408.98/879.21
  6. Step 6: Final answer
    x = 755.69

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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.