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Finding the Fourth Proportional to 21,893.01, 30,206.79 and 13,392.02

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Solution

The fourth proportional to 21,893.01, 30,206.79 and 13,392.02 is: 18,477.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,893.01 : 30,206.79 = 13,392.02 : x
  2. Step 2: Convert to fraction form
    21,893.01/30,206.79 = 13,392.02/x
  3. Step 3: Cross multiply
    21,893.01x = 30,206.79 × 13,392.02
  4. Step 4: Simplify right side
    21,893.01x = 404,529,935.82
  5. Step 5: Solve for x
    x = 404,529,935.82/21,893.01
  6. Step 6: Final answer
    x = 18,477.58

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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.