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Finding the Fourth Proportional to 8,405.44, 12,607.20 and 3,211.20

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Solution

The fourth proportional to 8,405.44, 12,607.20 and 3,211.20 is: 4,816.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,405.44 : 12,607.20 = 3,211.20 : x
  2. Step 2: Convert to fraction form
    8,405.44/12,607.20 = 3,211.20/x
  3. Step 3: Cross multiply
    8,405.44x = 12,607.20 × 3,211.20
  4. Step 4: Simplify right side
    8,405.44x = 40,484,240.64
  5. Step 5: Solve for x
    x = 40,484,240.64/8,405.44
  6. Step 6: Final answer
    x = 4,816.43

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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.