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Finding the Fourth Proportional to 18,761.58, 28,128.60 and 8,889.30

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Solution

The fourth proportional to 18,761.58, 28,128.60 and 8,889.30 is: 13,327.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.58 : 28,128.60 = 8,889.30 : x
  2. Step 2: Convert to fraction form
    18,761.58/28,128.60 = 8,889.30/x
  3. Step 3: Cross multiply
    18,761.58x = 28,128.60 × 8,889.30
  4. Step 4: Simplify right side
    18,761.58x = 250,043,563.98
  5. Step 5: Solve for x
    x = 250,043,563.98/18,761.58
  6. Step 6: Final answer
    x = 13,327.43

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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.