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Finding the Fourth Proportional to 7,943.40, 11,915.10 and 2,100.60

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Solution

The fourth proportional to 7,943.40, 11,915.10 and 2,100.60 is: 3,150.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,943.40 : 11,915.10 = 2,100.60 : x
  2. Step 2: Convert to fraction form
    7,943.40/11,915.10 = 2,100.60/x
  3. Step 3: Cross multiply
    7,943.40x = 11,915.10 × 2,100.60
  4. Step 4: Simplify right side
    7,943.40x = 25,028,859.06
  5. Step 5: Solve for x
    x = 25,028,859.06/7,943.40
  6. Step 6: Final answer
    x = 3,150.90

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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.