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Finding the Fourth Proportional to 879, 1,212.92 and 485.97

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Solution

The fourth proportional to 879, 1,212.92 and 485.97 is: 670.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    879 : 1,212.92 = 485.97 : x
  2. Step 2: Convert to fraction form
    879/1,212.92 = 485.97/x
  3. Step 3: Cross multiply
    879x = 1,212.92 × 485.97
  4. Step 4: Simplify right side
    879x = 589,440.30
  5. Step 5: Solve for x
    x = 589,440.30/879
  6. Step 6: Final answer
    x = 670.58

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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.