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Finding the Fourth Proportional to 9,378.08, 12,919.20 and 8,704.16

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Solution

The fourth proportional to 9,378.08, 12,919.20 and 8,704.16 is: 11,990.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,378.08 : 12,919.20 = 8,704.16 : x
  2. Step 2: Convert to fraction form
    9,378.08/12,919.20 = 8,704.16/x
  3. Step 3: Cross multiply
    9,378.08x = 12,919.20 × 8,704.16
  4. Step 4: Simplify right side
    9,378.08x = 112,450,783.87
  5. Step 5: Solve for x
    x = 112,450,783.87/9,378.08
  6. Step 6: Final answer
    x = 11,990.81

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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.