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Finding the Fourth Proportional to 9,806.64, 13,520.16 and 8,121.84

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Solution

The fourth proportional to 9,806.64, 13,520.16 and 8,121.84 is: 11,197.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,806.64 : 13,520.16 = 8,121.84 : x
  2. Step 2: Convert to fraction form
    9,806.64/13,520.16 = 8,121.84/x
  3. Step 3: Cross multiply
    9,806.64x = 13,520.16 × 8,121.84
  4. Step 4: Simplify right side
    9,806.64x = 109,808,576.29
  5. Step 5: Solve for x
    x = 109,808,576.29/9,806.64
  6. Step 6: Final answer
    x = 11,197.37

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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.