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Finding the Fourth Proportional to 19,286.56, 28,917.12 and 12,692.80

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Solution

The fourth proportional to 19,286.56, 28,917.12 and 12,692.80 is: 19,030.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,286.56 : 28,917.12 = 12,692.80 : x
  2. Step 2: Convert to fraction form
    19,286.56/28,917.12 = 12,692.80/x
  3. Step 3: Cross multiply
    19,286.56x = 28,917.12 × 12,692.80
  4. Step 4: Simplify right side
    19,286.56x = 367,039,220.74
  5. Step 5: Solve for x
    x = 367,039,220.74/19,286.56
  6. Step 6: Final answer
    x = 19,030.83

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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.