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Finding the Fourth Proportional to 2,129.61, 3,194.58 and 668.75

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Solution

The fourth proportional to 2,129.61, 3,194.58 and 668.75 is: 1,003.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.61 : 3,194.58 = 668.75 : x
  2. Step 2: Convert to fraction form
    2,129.61/3,194.58 = 668.75/x
  3. Step 3: Cross multiply
    2,129.61x = 3,194.58 × 668.75
  4. Step 4: Simplify right side
    2,129.61x = 2,136,375.38
  5. Step 5: Solve for x
    x = 2,136,375.38/2,129.61
  6. Step 6: Final answer
    x = 1,003.18

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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.