Home / 20,738.21-31,087.61-13,220.67

Finding the Fourth Proportional to 20,738.21, 31,087.61 and 13,220.67

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Solution

The fourth proportional to 20,738.21, 31,087.61 and 13,220.67 is: 19,818.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,738.21 : 31,087.61 = 13,220.67 : x
  2. Step 2: Convert to fraction form
    20,738.21/31,087.61 = 13,220.67/x
  3. Step 3: Cross multiply
    20,738.21x = 31,087.61 × 13,220.67
  4. Step 4: Simplify right side
    20,738.21x = 410,998,941.56
  5. Step 5: Solve for x
    x = 410,998,941.56/20,738.21
  6. Step 6: Final answer
    x = 19,818.44

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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.