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Finding the Fourth Proportional to 21,389.51, 29,514.94 and 11,828.09

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Solution

The fourth proportional to 21,389.51, 29,514.94 and 11,828.09 is: 16,321.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,389.51 : 29,514.94 = 11,828.09 : x
  2. Step 2: Convert to fraction form
    21,389.51/29,514.94 = 11,828.09/x
  3. Step 3: Cross multiply
    21,389.51x = 29,514.94 × 11,828.09
  4. Step 4: Simplify right side
    21,389.51x = 349,105,366.66
  5. Step 5: Solve for x
    x = 349,105,366.66/21,389.51
  6. Step 6: Final answer
    x = 16,321.34

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.