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Finding the Fourth Proportional to 18,687.81, 25,786.23 and 11,133.95

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Solution

The fourth proportional to 18,687.81, 25,786.23 and 11,133.95 is: 15,363.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.81 : 25,786.23 = 11,133.95 : x
  2. Step 2: Convert to fraction form
    18,687.81/25,786.23 = 11,133.95/x
  3. Step 3: Cross multiply
    18,687.81x = 25,786.23 × 11,133.95
  4. Step 4: Simplify right side
    18,687.81x = 287,102,595.51
  5. Step 5: Solve for x
    x = 287,102,595.51/18,687.81
  6. Step 6: Final answer
    x = 15,363.10

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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.