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Finding the Fourth Proportional to 8,439.71, 12,639.84 and 6,672.84

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Solution

The fourth proportional to 8,439.71, 12,639.84 and 6,672.84 is: 9,993.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,439.71 : 12,639.84 = 6,672.84 : x
  2. Step 2: Convert to fraction form
    8,439.71/12,639.84 = 6,672.84/x
  3. Step 3: Cross multiply
    8,439.71x = 12,639.84 × 6,672.84
  4. Step 4: Simplify right side
    8,439.71x = 84,343,629.95
  5. Step 5: Solve for x
    x = 84,343,629.95/8,439.71
  6. Step 6: Final answer
    x = 9,993.67

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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.