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Finding the Fourth Proportional to 28,763.28, 43,144.56 and 7,986.60

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Solution

The fourth proportional to 28,763.28, 43,144.56 and 7,986.60 is: 11,979.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,763.28 : 43,144.56 = 7,986.60 : x
  2. Step 2: Convert to fraction form
    28,763.28/43,144.56 = 7,986.60/x
  3. Step 3: Cross multiply
    28,763.28x = 43,144.56 × 7,986.60
  4. Step 4: Simplify right side
    28,763.28x = 344,578,342.90
  5. Step 5: Solve for x
    x = 344,578,342.90/28,763.28
  6. Step 6: Final answer
    x = 11,979.80

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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.