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Finding the Fourth Proportional to 21,679.00, 29,921.84 and 13,179.32

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Solution

The fourth proportional to 21,679.00, 29,921.84 and 13,179.32 is: 18,190.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,679.00 : 29,921.84 = 13,179.32 : x
  2. Step 2: Convert to fraction form
    21,679.00/29,921.84 = 13,179.32/x
  3. Step 3: Cross multiply
    21,679.00x = 29,921.84 × 13,179.32
  4. Step 4: Simplify right side
    21,679.00x = 394,349,394.37
  5. Step 5: Solve for x
    x = 394,349,394.37/21,679.00
  6. Step 6: Final answer
    x = 18,190.39

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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.