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Finding the Fourth Proportional to 18,911.53, 28,362.74 and 8,375.73

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Solution

The fourth proportional to 18,911.53, 28,362.74 and 8,375.73 is: 12,561.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.53 : 28,362.74 = 8,375.73 : x
  2. Step 2: Convert to fraction form
    18,911.53/28,362.74 = 8,375.73/x
  3. Step 3: Cross multiply
    18,911.53x = 28,362.74 × 8,375.73
  4. Step 4: Simplify right side
    18,911.53x = 237,558,652.30
  5. Step 5: Solve for x
    x = 237,558,652.30/18,911.53
  6. Step 6: Final answer
    x = 12,561.58

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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.