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Finding the Fourth Proportional to 6,640.72, 9,959.56 and 1,960.80

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Solution

The fourth proportional to 6,640.72, 9,959.56 and 1,960.80 is: 2,940.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640.72 : 9,959.56 = 1,960.80 : x
  2. Step 2: Convert to fraction form
    6,640.72/9,959.56 = 1,960.80/x
  3. Step 3: Cross multiply
    6,640.72x = 9,959.56 × 1,960.80
  4. Step 4: Simplify right side
    6,640.72x = 19,528,705.25
  5. Step 5: Solve for x
    x = 19,528,705.25/6,640.72
  6. Step 6: Final answer
    x = 2,940.75

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1.5x scale

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.