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Finding the Fourth Proportional to 21,704.88, 29,958.90 and 13,208.34

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Solution

The fourth proportional to 21,704.88, 29,958.90 and 13,208.34 is: 18,231.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,704.88 : 29,958.90 = 13,208.34 : x
  2. Step 2: Convert to fraction form
    21,704.88/29,958.90 = 13,208.34/x
  3. Step 3: Cross multiply
    21,704.88x = 29,958.90 × 13,208.34
  4. Step 4: Simplify right side
    21,704.88x = 395,707,337.23
  5. Step 5: Solve for x
    x = 395,707,337.23/21,704.88
  6. Step 6: Final answer
    x = 18,231.26

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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.