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Finding the Fourth Proportional to 2,129.60, 3,194.40 and 668.90

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Solution

The fourth proportional to 2,129.60, 3,194.40 and 668.90 is: 1,003.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.60 : 3,194.40 = 668.90 : x
  2. Step 2: Convert to fraction form
    2,129.60/3,194.40 = 668.90/x
  3. Step 3: Cross multiply
    2,129.60x = 3,194.40 × 668.90
  4. Step 4: Simplify right side
    2,129.60x = 2,136,734.16
  5. Step 5: Solve for x
    x = 2,136,734.16/2,129.60
  6. Step 6: Final answer
    x = 1,003.35

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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.