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Finding the Fourth Proportional to 2,112.68, 3,168.36 and 879.77

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Solution

The fourth proportional to 2,112.68, 3,168.36 and 879.77 is: 1,319.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,112.68 : 3,168.36 = 879.77 : x
  2. Step 2: Convert to fraction form
    2,112.68/3,168.36 = 879.77/x
  3. Step 3: Cross multiply
    2,112.68x = 3,168.36 × 879.77
  4. Step 4: Simplify right side
    2,112.68x = 2,787,436.00
  5. Step 5: Solve for x
    x = 2,787,436.00/2,112.68
  6. Step 6: Final answer
    x = 1,319.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.