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Finding the Fourth Proportional to 21,138.96, 29,138.22 and 16,655.88

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Solution

The fourth proportional to 21,138.96, 29,138.22 and 16,655.88 is: 22,958.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.96 : 29,138.22 = 16,655.88 : x
  2. Step 2: Convert to fraction form
    21,138.96/29,138.22 = 16,655.88/x
  3. Step 3: Cross multiply
    21,138.96x = 29,138.22 × 16,655.88
  4. Step 4: Simplify right side
    21,138.96x = 485,322,695.73
  5. Step 5: Solve for x
    x = 485,322,695.73/21,138.96
  6. Step 6: Final answer
    x = 22,958.68

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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.