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Finding the Fourth Proportional to 2,768.66, 4,153.02 and 820.90

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Solution

The fourth proportional to 2,768.66, 4,153.02 and 820.90 is: 1,231.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,768.66 : 4,153.02 = 820.90 : x
  2. Step 2: Convert to fraction form
    2,768.66/4,153.02 = 820.90/x
  3. Step 3: Cross multiply
    2,768.66x = 4,153.02 × 820.90
  4. Step 4: Simplify right side
    2,768.66x = 3,409,214.12
  5. Step 5: Solve for x
    x = 3,409,214.12/2,768.66
  6. Step 6: Final answer
    x = 1,231.36

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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.