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Finding the Fourth Proportional to 2,756.81, 4,140.86 and 1,821.13

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Solution

The fourth proportional to 2,756.81, 4,140.86 and 1,821.13 is: 2,735.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,756.81 : 4,140.86 = 1,821.13 : x
  2. Step 2: Convert to fraction form
    2,756.81/4,140.86 = 1,821.13/x
  3. Step 3: Cross multiply
    2,756.81x = 4,140.86 × 1,821.13
  4. Step 4: Simplify right side
    2,756.81x = 7,541,044.37
  5. Step 5: Solve for x
    x = 7,541,044.37/2,756.81
  6. Step 6: Final answer
    x = 2,735.43

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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.