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Finding the Fourth Proportional to 18,736.22, 28,105.95 and 7,643.67

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Solution

The fourth proportional to 18,736.22, 28,105.95 and 7,643.67 is: 11,466.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,736.22 : 28,105.95 = 7,643.67 : x
  2. Step 2: Convert to fraction form
    18,736.22/28,105.95 = 7,643.67/x
  3. Step 3: Cross multiply
    18,736.22x = 28,105.95 × 7,643.67
  4. Step 4: Simplify right side
    18,736.22x = 214,832,606.84
  5. Step 5: Solve for x
    x = 214,832,606.84/18,736.22
  6. Step 6: Final answer
    x = 11,466.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.