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Finding the Fourth Proportional to 9,900.45, 13,662.21 and 5,919.21

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Solution

The fourth proportional to 9,900.45, 13,662.21 and 5,919.21 is: 8,168.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,900.45 : 13,662.21 = 5,919.21 : x
  2. Step 2: Convert to fraction form
    9,900.45/13,662.21 = 5,919.21/x
  3. Step 3: Cross multiply
    9,900.45x = 13,662.21 × 5,919.21
  4. Step 4: Simplify right side
    9,900.45x = 80,869,490.05
  5. Step 5: Solve for x
    x = 80,869,490.05/9,900.45
  6. Step 6: Final answer
    x = 8,168.26

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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.