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Finding the Fourth Proportional to 3,561.75, 4,915.22 and 1,990.22

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Solution

The fourth proportional to 3,561.75, 4,915.22 and 1,990.22 is: 2,746.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,561.75 : 4,915.22 = 1,990.22 : x
  2. Step 2: Convert to fraction form
    3,561.75/4,915.22 = 1,990.22/x
  3. Step 3: Cross multiply
    3,561.75x = 4,915.22 × 1,990.22
  4. Step 4: Simplify right side
    3,561.75x = 9,782,334.62
  5. Step 5: Solve for x
    x = 9,782,334.62/3,561.75
  6. Step 6: Final answer
    x = 2,746.50

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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.