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Finding the Fourth Proportional to 2,769.72, 4,155 and 821.68

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Solution

The fourth proportional to 2,769.72, 4,155 and 821.68 is: 1,232.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,769.72 : 4,155 = 821.68 : x
  2. Step 2: Convert to fraction form
    2,769.72/4,155 = 821.68/x
  3. Step 3: Cross multiply
    2,769.72x = 4,155 × 821.68
  4. Step 4: Simplify right side
    2,769.72x = 3,414,080.40
  5. Step 5: Solve for x
    x = 3,414,080.40/2,769.72
  6. Step 6: Final answer
    x = 1,232.64

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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.