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Finding the Fourth Proportional to 19,209.35, 28,822.94 and 8,118.63

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Solution

The fourth proportional to 19,209.35, 28,822.94 and 8,118.63 is: 12,181.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,209.35 : 28,822.94 = 8,118.63 : x
  2. Step 2: Convert to fraction form
    19,209.35/28,822.94 = 8,118.63/x
  3. Step 3: Cross multiply
    19,209.35x = 28,822.94 × 8,118.63
  4. Step 4: Simplify right side
    19,209.35x = 234,002,775.22
  5. Step 5: Solve for x
    x = 234,002,775.22/19,209.35
  6. Step 6: Final answer
    x = 12,181.71

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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.