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Finding the Fourth Proportional to 39,684.76, 54,765.38 and 21,780.92

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Solution

The fourth proportional to 39,684.76, 54,765.38 and 21,780.92 is: 30,057.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,684.76 : 54,765.38 = 21,780.92 : x
  2. Step 2: Convert to fraction form
    39,684.76/54,765.38 = 21,780.92/x
  3. Step 3: Cross multiply
    39,684.76x = 54,765.38 × 21,780.92
  4. Step 4: Simplify right side
    39,684.76x = 1,192,840,360.55
  5. Step 5: Solve for x
    x = 1,192,840,360.55/39,684.76
  6. Step 6: Final answer
    x = 30,057.90

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