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Finding the Fourth Proportional to 2,769.54, 4,153.59 and 821.28

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Solution

The fourth proportional to 2,769.54, 4,153.59 and 821.28 is: 1,231.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,769.54 : 4,153.59 = 821.28 : x
  2. Step 2: Convert to fraction form
    2,769.54/4,153.59 = 821.28/x
  3. Step 3: Cross multiply
    2,769.54x = 4,153.59 × 821.28
  4. Step 4: Simplify right side
    2,769.54x = 3,411,260.40
  5. Step 5: Solve for x
    x = 3,411,260.40/2,769.54
  6. Step 6: Final answer
    x = 1,231.71

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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.