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Finding the Fourth Proportional to 21,107.56, 29,125.90 and 12,157.97

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Solution

The fourth proportional to 21,107.56, 29,125.90 and 12,157.97 is: 16,776.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,107.56 : 29,125.90 = 12,157.97 : x
  2. Step 2: Convert to fraction form
    21,107.56/29,125.90 = 12,157.97/x
  3. Step 3: Cross multiply
    21,107.56x = 29,125.90 × 12,157.97
  4. Step 4: Simplify right side
    21,107.56x = 354,111,818.42
  5. Step 5: Solve for x
    x = 354,111,818.42/21,107.56
  6. Step 6: Final answer
    x = 16,776.54

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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.