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Finding the Fourth Proportional to 39,784.71, 54,901.80 and 21,879.71

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Solution

The fourth proportional to 39,784.71, 54,901.80 and 21,879.71 is: 30,193.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,784.71 : 54,901.80 = 21,879.71 : x
  2. Step 2: Convert to fraction form
    39,784.71/54,901.80 = 21,879.71/x
  3. Step 3: Cross multiply
    39,784.71x = 54,901.80 × 21,879.71
  4. Step 4: Simplify right side
    39,784.71x = 1,201,235,599.73
  5. Step 5: Solve for x
    x = 1,201,235,599.73/39,784.71
  6. Step 6: Final answer
    x = 30,193.40

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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.