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Finding the Fourth Proportional to 66,961.46, 100,439.31 and 20,212.94

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Solution

The fourth proportional to 66,961.46, 100,439.31 and 20,212.94 is: 30,318.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,961.46 : 100,439.31 = 20,212.94 : x
  2. Step 2: Convert to fraction form
    66,961.46/100,439.31 = 20,212.94/x
  3. Step 3: Cross multiply
    66,961.46x = 100,439.31 × 20,212.94
  4. Step 4: Simplify right side
    66,961.46x = 2,030,173,419.77
  5. Step 5: Solve for x
    x = 2,030,173,419.77/66,961.46
  6. Step 6: Final answer
    x = 30,318.54

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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.