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Finding the Fourth Proportional to 12,690.70, 18,999.60 and 11,232.70

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Solution

The fourth proportional to 12,690.70, 18,999.60 and 11,232.70 is: 16,816.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.70 : 18,999.60 = 11,232.70 : x
  2. Step 2: Convert to fraction form
    12,690.70/18,999.60 = 11,232.70/x
  3. Step 3: Cross multiply
    12,690.70x = 18,999.60 × 11,232.70
  4. Step 4: Simplify right side
    12,690.70x = 213,416,806.92
  5. Step 5: Solve for x
    x = 213,416,806.92/12,690.70
  6. Step 6: Final answer
    x = 16,816.79

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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.