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Finding the Fourth Proportional to 70,571.20, 105,845.83 and 20,639.56

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Solution

The fourth proportional to 70,571.20, 105,845.83 and 20,639.56 is: 30,956.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,571.20 : 105,845.83 = 20,639.56 : x
  2. Step 2: Convert to fraction form
    70,571.20/105,845.83 = 20,639.56/x
  3. Step 3: Cross multiply
    70,571.20x = 105,845.83 × 20,639.56
  4. Step 4: Simplify right side
    70,571.20x = 2,184,611,359.03
  5. Step 5: Solve for x
    x = 2,184,611,359.03/70,571.20
  6. Step 6: Final answer
    x = 30,956.13

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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.