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Finding the Fourth Proportional to 1,813.81, 2,721.05 and 839.91

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Solution

The fourth proportional to 1,813.81, 2,721.05 and 839.91 is: 1,260.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.81 : 2,721.05 = 839.91 : x
  2. Step 2: Convert to fraction form
    1,813.81/2,721.05 = 839.91/x
  3. Step 3: Cross multiply
    1,813.81x = 2,721.05 × 839.91
  4. Step 4: Simplify right side
    1,813.81x = 2,285,439.21
  5. Step 5: Solve for x
    x = 2,285,439.21/1,813.81
  6. Step 6: Final answer
    x = 1,260.02

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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.