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Finding the Fourth Proportional to 39,784.96, 54,902.15 and 21,879.96

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Solution

The fourth proportional to 39,784.96, 54,902.15 and 21,879.96 is: 30,193.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,784.96 : 54,902.15 = 21,879.96 : x
  2. Step 2: Convert to fraction form
    39,784.96/54,902.15 = 21,879.96/x
  3. Step 3: Cross multiply
    39,784.96x = 54,902.15 × 21,879.96
  4. Step 4: Simplify right side
    39,784.96x = 1,201,257,014.38
  5. Step 5: Solve for x
    x = 1,201,257,014.38/39,784.96
  6. Step 6: Final answer
    x = 30,193.75

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Why These Related Problems?

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