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Finding the Fourth Proportional to 2,129.80, 3,193.60 and 668.56

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Solution

The fourth proportional to 2,129.80, 3,193.60 and 668.56 is: 1,002.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.80 : 3,193.60 = 668.56 : x
  2. Step 2: Convert to fraction form
    2,129.80/3,193.60 = 668.56/x
  3. Step 3: Cross multiply
    2,129.80x = 3,193.60 × 668.56
  4. Step 4: Simplify right side
    2,129.80x = 2,135,113.22
  5. Step 5: Solve for x
    x = 2,135,113.22/2,129.80
  6. Step 6: Final answer
    x = 1,002.49

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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.