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Finding the Fourth Proportional to 12,221.64, 18,330.08 and 3,899.43

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Solution

The fourth proportional to 12,221.64, 18,330.08 and 3,899.43 is: 5,848.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,221.64 : 18,330.08 = 3,899.43 : x
  2. Step 2: Convert to fraction form
    12,221.64/18,330.08 = 3,899.43/x
  3. Step 3: Cross multiply
    12,221.64x = 18,330.08 × 3,899.43
  4. Step 4: Simplify right side
    12,221.64x = 71,476,844.36
  5. Step 5: Solve for x
    x = 71,476,844.36/12,221.64
  6. Step 6: Final answer
    x = 5,848.38

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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.