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Finding the Fourth Proportional to 20,408.60, 30,605.70 and 7,261.40

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Solution

The fourth proportional to 20,408.60, 30,605.70 and 7,261.40 is: 10,889.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,408.60 : 30,605.70 = 7,261.40 : x
  2. Step 2: Convert to fraction form
    20,408.60/30,605.70 = 7,261.40/x
  3. Step 3: Cross multiply
    20,408.60x = 30,605.70 × 7,261.40
  4. Step 4: Simplify right side
    20,408.60x = 222,240,229.98
  5. Step 5: Solve for x
    x = 222,240,229.98/20,408.60
  6. Step 6: Final answer
    x = 10,889.54

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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.