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Finding the Fourth Proportional to 12,290.70, 18,399.60 and 8,135.40

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Solution

The fourth proportional to 12,290.70, 18,399.60 and 8,135.40 is: 12,178.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,290.70 : 18,399.60 = 8,135.40 : x
  2. Step 2: Convert to fraction form
    12,290.70/18,399.60 = 8,135.40/x
  3. Step 3: Cross multiply
    12,290.70x = 18,399.60 × 8,135.40
  4. Step 4: Simplify right side
    12,290.70x = 149,688,105.84
  5. Step 5: Solve for x
    x = 149,688,105.84/12,290.70
  6. Step 6: Final answer
    x = 12,178.97

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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.