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Finding the Fourth Proportional to 879.07, 1,212.63 and 579.73

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Solution

The fourth proportional to 879.07, 1,212.63 and 579.73 is: 799.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.07 : 1,212.63 = 579.73 : x
  2. Step 2: Convert to fraction form
    879.07/1,212.63 = 579.73/x
  3. Step 3: Cross multiply
    879.07x = 1,212.63 × 579.73
  4. Step 4: Simplify right side
    879.07x = 702,993.95
  5. Step 5: Solve for x
    x = 702,993.95/879.07
  6. Step 6: Final answer
    x = 799.70

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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.