Home / 20,605.56-28,435.84-12,105.40

Finding the Fourth Proportional to 20,605.56, 28,435.84 and 12,105.40

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Solution

The fourth proportional to 20,605.56, 28,435.84 and 12,105.40 is: 16,705.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,605.56 : 28,435.84 = 12,105.40 : x
  2. Step 2: Convert to fraction form
    20,605.56/28,435.84 = 12,105.40/x
  3. Step 3: Cross multiply
    20,605.56x = 28,435.84 × 12,105.40
  4. Step 4: Simplify right side
    20,605.56x = 344,227,217.54
  5. Step 5: Solve for x
    x = 344,227,217.54/20,605.56
  6. Step 6: Final answer
    x = 16,705.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.