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Finding the Fourth Proportional to 2,640.40, 3,643.99 and 1,976.00

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Solution

The fourth proportional to 2,640.40, 3,643.99 and 1,976.00 is: 2,727.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.40 : 3,643.99 = 1,976.00 : x
  2. Step 2: Convert to fraction form
    2,640.40/3,643.99 = 1,976.00/x
  3. Step 3: Cross multiply
    2,640.40x = 3,643.99 × 1,976.00
  4. Step 4: Simplify right side
    2,640.40x = 7,200,501.08
  5. Step 5: Solve for x
    x = 7,200,501.08/2,640.40
  6. Step 6: Final answer
    x = 2,727.05

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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.