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Finding the Fourth Proportional to 18,996.56, 28,491.48 and 5,146.64

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Solution

The fourth proportional to 18,996.56, 28,491.48 and 5,146.64 is: 7,719.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,996.56 : 28,491.48 = 5,146.64 : x
  2. Step 2: Convert to fraction form
    18,996.56/28,491.48 = 5,146.64/x
  3. Step 3: Cross multiply
    18,996.56x = 28,491.48 × 5,146.64
  4. Step 4: Simplify right side
    18,996.56x = 146,635,390.63
  5. Step 5: Solve for x
    x = 146,635,390.63/18,996.56
  6. Step 6: Final answer
    x = 7,719.05

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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.