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Finding the Fourth Proportional to 18,921.90, 28,399.05 and 8,408.10

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Solution

The fourth proportional to 18,921.90, 28,399.05 and 8,408.10 is: 12,619.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.90 : 28,399.05 = 8,408.10 : x
  2. Step 2: Convert to fraction form
    18,921.90/28,399.05 = 8,408.10/x
  3. Step 3: Cross multiply
    18,921.90x = 28,399.05 × 8,408.10
  4. Step 4: Simplify right side
    18,921.90x = 238,782,052.31
  5. Step 5: Solve for x
    x = 238,782,052.31/18,921.90
  6. Step 6: Final answer
    x = 12,619.35

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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.