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Finding the Fourth Proportional to 8,615.36, 12,912.61 and 3,928.95

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Solution

The fourth proportional to 8,615.36, 12,912.61 and 3,928.95 is: 5,888.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.36 : 12,912.61 = 3,928.95 : x
  2. Step 2: Convert to fraction form
    8,615.36/12,912.61 = 3,928.95/x
  3. Step 3: Cross multiply
    8,615.36x = 12,912.61 × 3,928.95
  4. Step 4: Simplify right side
    8,615.36x = 50,732,979.41
  5. Step 5: Solve for x
    x = 50,732,979.41/8,615.36
  6. Step 6: Final answer
    x = 5,888.67

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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.