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Finding the Fourth Proportional to 3,239, 4,469.76 and 1,912.83

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Solution

The fourth proportional to 3,239, 4,469.76 and 1,912.83 is: 2,639.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,239 : 4,469.76 = 1,912.83 : x
  2. Step 2: Convert to fraction form
    3,239/4,469.76 = 1,912.83/x
  3. Step 3: Cross multiply
    3,239x = 4,469.76 × 1,912.83
  4. Step 4: Simplify right side
    3,239x = 8,549,891.02
  5. Step 5: Solve for x
    x = 8,549,891.02/3,239
  6. Step 6: Final answer
    x = 2,639.67

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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.