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Finding the Fourth Proportional to 15,040.76, 20,739.30 and 9,728.60

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Solution

The fourth proportional to 15,040.76, 20,739.30 and 9,728.60 is: 13,414.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,040.76 : 20,739.30 = 9,728.60 : x
  2. Step 2: Convert to fraction form
    15,040.76/20,739.30 = 9,728.60/x
  3. Step 3: Cross multiply
    15,040.76x = 20,739.30 × 9,728.60
  4. Step 4: Simplify right side
    15,040.76x = 201,764,353.98
  5. Step 5: Solve for x
    x = 201,764,353.98/15,040.76
  6. Step 6: Final answer
    x = 13,414.51

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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.