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Finding the Fourth Proportional to 39,784.88, 54,902.04 and 21,879.88

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Solution

The fourth proportional to 39,784.88, 54,902.04 and 21,879.88 is: 30,193.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,784.88 : 54,902.04 = 21,879.88 : x
  2. Step 2: Convert to fraction form
    39,784.88/54,902.04 = 21,879.88/x
  3. Step 3: Cross multiply
    39,784.88x = 54,902.04 × 21,879.88
  4. Step 4: Simplify right side
    39,784.88x = 1,201,250,046.96
  5. Step 5: Solve for x
    x = 1,201,250,046.96/39,784.88
  6. Step 6: Final answer
    x = 30,193.63

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1.5x scale

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.