Home / 100,406.10-138,704.60-80,236.56

Finding the Fourth Proportional to 100,406.10, 138,704.60 and 80,236.56

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Solution

The fourth proportional to 100,406.10, 138,704.60 and 80,236.56 is: 110,841.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,406.10 : 138,704.60 = 80,236.56 : x
  2. Step 2: Convert to fraction form
    100,406.10/138,704.60 = 80,236.56/x
  3. Step 3: Cross multiply
    100,406.10x = 138,704.60 × 80,236.56
  4. Step 4: Simplify right side
    100,406.10x = 11,129,179,960.18
  5. Step 5: Solve for x
    x = 11,129,179,960.18/100,406.10
  6. Step 6: Final answer
    x = 110,841.67

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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.