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Finding the Fourth Proportional to 20,665.53, 28,519.02 and 11,712.67

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Solution

The fourth proportional to 20,665.53, 28,519.02 and 11,712.67 is: 16,163.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,665.53 : 28,519.02 = 11,712.67 : x
  2. Step 2: Convert to fraction form
    20,665.53/28,519.02 = 11,712.67/x
  3. Step 3: Cross multiply
    20,665.53x = 28,519.02 × 11,712.67
  4. Step 4: Simplify right side
    20,665.53x = 334,033,798.69
  5. Step 5: Solve for x
    x = 334,033,798.69/20,665.53
  6. Step 6: Final answer
    x = 16,163.81

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.