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Finding the Fourth Proportional to 21,879.64, 30,190.86 and 12,447.16

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Solution

The fourth proportional to 21,879.64, 30,190.86 and 12,447.16 is: 17,175.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.64 : 30,190.86 = 12,447.16 : x
  2. Step 2: Convert to fraction form
    21,879.64/30,190.86 = 12,447.16/x
  3. Step 3: Cross multiply
    21,879.64x = 30,190.86 × 12,447.16
  4. Step 4: Simplify right side
    21,879.64x = 375,790,464.96
  5. Step 5: Solve for x
    x = 375,790,464.96/21,879.64
  6. Step 6: Final answer
    x = 17,175.35

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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.