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Finding the Fourth Proportional to 18,503.64, 27,764.57 and 8,643.61

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Solution

The fourth proportional to 18,503.64, 27,764.57 and 8,643.61 is: 12,969.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,503.64 : 27,764.57 = 8,643.61 : x
  2. Step 2: Convert to fraction form
    18,503.64/27,764.57 = 8,643.61/x
  3. Step 3: Cross multiply
    18,503.64x = 27,764.57 × 8,643.61
  4. Step 4: Simplify right side
    18,503.64x = 239,986,171.21
  5. Step 5: Solve for x
    x = 239,986,171.21/18,503.64
  6. Step 6: Final answer
    x = 12,969.67

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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.