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Finding the Fourth Proportional to 18,388.50, 25,378.29 and 10,936.50

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Solution

The fourth proportional to 18,388.50, 25,378.29 and 10,936.50 is: 15,093.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,388.50 : 25,378.29 = 10,936.50 : x
  2. Step 2: Convert to fraction form
    18,388.50/25,378.29 = 10,936.50/x
  3. Step 3: Cross multiply
    18,388.50x = 25,378.29 × 10,936.50
  4. Step 4: Simplify right side
    18,388.50x = 277,549,668.59
  5. Step 5: Solve for x
    x = 277,549,668.59/18,388.50
  6. Step 6: Final answer
    x = 15,093.65

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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.