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Finding the Fourth Proportional to 21,553, 29,743.56 and 13,055.44

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Solution

The fourth proportional to 21,553, 29,743.56 and 13,055.44 is: 18,016.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,553 : 29,743.56 = 13,055.44 : x
  2. Step 2: Convert to fraction form
    21,553/29,743.56 = 13,055.44/x
  3. Step 3: Cross multiply
    21,553x = 29,743.56 × 13,055.44
  4. Step 4: Simplify right side
    21,553x = 388,315,262.97
  5. Step 5: Solve for x
    x = 388,315,262.97/21,553
  6. Step 6: Final answer
    x = 18,016.76

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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.