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Finding the Fourth Proportional to 3,129.75, 4,694.63 and 821.25

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Solution

The fourth proportional to 3,129.75, 4,694.63 and 821.25 is: 1,231.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.75 : 4,694.63 = 821.25 : x
  2. Step 2: Convert to fraction form
    3,129.75/4,694.63 = 821.25/x
  3. Step 3: Cross multiply
    3,129.75x = 4,694.63 × 821.25
  4. Step 4: Simplify right side
    3,129.75x = 3,855,460.78
  5. Step 5: Solve for x
    x = 3,855,460.78/3,129.75
  6. Step 6: Final answer
    x = 1,231.88

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Similar ratio
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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.