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Finding the Fourth Proportional to 18,636.11, 25,712.73 and 12,964.49

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Solution

The fourth proportional to 18,636.11, 25,712.73 and 12,964.49 is: 17,887.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,636.11 : 25,712.73 = 12,964.49 : x
  2. Step 2: Convert to fraction form
    18,636.11/25,712.73 = 12,964.49/x
  3. Step 3: Cross multiply
    18,636.11x = 25,712.73 × 12,964.49
  4. Step 4: Simplify right side
    18,636.11x = 333,352,302.39
  5. Step 5: Solve for x
    x = 333,352,302.39/18,636.11
  6. Step 6: Final answer
    x = 17,887.44

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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.