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Finding the Fourth Proportional to 13,621, 18,796.98 and 8,661.64

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Solution

The fourth proportional to 13,621, 18,796.98 and 8,661.64 is: 11,953.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,621 : 18,796.98 = 8,661.64 : x
  2. Step 2: Convert to fraction form
    13,621/18,796.98 = 8,661.64/x
  3. Step 3: Cross multiply
    13,621x = 18,796.98 × 8,661.64
  4. Step 4: Simplify right side
    13,621x = 162,812,673.85
  5. Step 5: Solve for x
    x = 162,812,673.85/13,621
  6. Step 6: Final answer
    x = 11,953.06

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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.