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Finding the Fourth Proportional to 20,379.54, 30,554.82 and 7,889.02

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Solution

The fourth proportional to 20,379.54, 30,554.82 and 7,889.02 is: 11,827.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.54 : 30,554.82 = 7,889.02 : x
  2. Step 2: Convert to fraction form
    20,379.54/30,554.82 = 7,889.02/x
  3. Step 3: Cross multiply
    20,379.54x = 30,554.82 × 7,889.02
  4. Step 4: Simplify right side
    20,379.54x = 241,047,586.08
  5. Step 5: Solve for x
    x = 241,047,586.08/20,379.54
  6. Step 6: Final answer
    x = 11,827.92

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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.