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Finding the Fourth Proportional to 879.21, 1,213.52 and 564.39

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Solution

The fourth proportional to 879.21, 1,213.52 and 564.39 is: 778.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.21 : 1,213.52 = 564.39 : x
  2. Step 2: Convert to fraction form
    879.21/1,213.52 = 564.39/x
  3. Step 3: Cross multiply
    879.21x = 1,213.52 × 564.39
  4. Step 4: Simplify right side
    879.21x = 684,895.73
  5. Step 5: Solve for x
    x = 684,895.73/879.21
  6. Step 6: Final answer
    x = 778.99

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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.