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Finding the Fourth Proportional to 15,003.76, 20,704.90 and 8,289.68

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Solution

The fourth proportional to 15,003.76, 20,704.90 and 8,289.68 is: 11,439.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,003.76 : 20,704.90 = 8,289.68 : x
  2. Step 2: Convert to fraction form
    15,003.76/20,704.90 = 8,289.68/x
  3. Step 3: Cross multiply
    15,003.76x = 20,704.90 × 8,289.68
  4. Step 4: Simplify right side
    15,003.76x = 171,636,995.43
  5. Step 5: Solve for x
    x = 171,636,995.43/15,003.76
  6. Step 6: Final answer
    x = 11,439.60

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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.