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Finding the Fourth Proportional to 16,990, 25,435.56 and 12,626.80

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Solution

The fourth proportional to 16,990, 25,435.56 and 12,626.80 is: 18,903.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,990 : 25,435.56 = 12,626.80 : x
  2. Step 2: Convert to fraction form
    16,990/25,435.56 = 12,626.80/x
  3. Step 3: Cross multiply
    16,990x = 25,435.56 × 12,626.80
  4. Step 4: Simplify right side
    16,990x = 321,169,729.01
  5. Step 5: Solve for x
    x = 321,169,729.01/16,990
  6. Step 6: Final answer
    x = 18,903.46

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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.