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Finding the Fourth Proportional to 20,639.81, 30,960.02 and 5,057.44

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Solution

The fourth proportional to 20,639.81, 30,960.02 and 5,057.44 is: 7,586.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.81 : 30,960.02 = 5,057.44 : x
  2. Step 2: Convert to fraction form
    20,639.81/30,960.02 = 5,057.44/x
  3. Step 3: Cross multiply
    20,639.81x = 30,960.02 × 5,057.44
  4. Step 4: Simplify right side
    20,639.81x = 156,578,378.79
  5. Step 5: Solve for x
    x = 156,578,378.79/20,639.81
  6. Step 6: Final answer
    x = 7,586.23

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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.