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Finding the Fourth Proportional to 2,820.81, 4,231.32 and 872.97

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Solution

The fourth proportional to 2,820.81, 4,231.32 and 872.97 is: 1,309.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,820.81 : 4,231.32 = 872.97 : x
  2. Step 2: Convert to fraction form
    2,820.81/4,231.32 = 872.97/x
  3. Step 3: Cross multiply
    2,820.81x = 4,231.32 × 872.97
  4. Step 4: Simplify right side
    2,820.81x = 3,693,815.42
  5. Step 5: Solve for x
    x = 3,693,815.42/2,820.81
  6. Step 6: Final answer
    x = 1,309.49

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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.