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Finding the Fourth Proportional to 2,805.90, 3,868.09 and 1,963.99

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Solution

The fourth proportional to 2,805.90, 3,868.09 and 1,963.99 is: 2,707.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,805.90 : 3,868.09 = 1,963.99 : x
  2. Step 2: Convert to fraction form
    2,805.90/3,868.09 = 1,963.99/x
  3. Step 3: Cross multiply
    2,805.90x = 3,868.09 × 1,963.99
  4. Step 4: Simplify right side
    2,805.90x = 7,596,890.08
  5. Step 5: Solve for x
    x = 7,596,890.08/2,805.90
  6. Step 6: Final answer
    x = 2,707.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.