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Finding the Fourth Proportional to 39,720.95, 54,815.24 and 21,816.17

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Solution

The fourth proportional to 39,720.95, 54,815.24 and 21,816.17 is: 30,106.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.95 : 54,815.24 = 21,816.17 : x
  2. Step 2: Convert to fraction form
    39,720.95/54,815.24 = 21,816.17/x
  3. Step 3: Cross multiply
    39,720.95x = 54,815.24 × 21,816.17
  4. Step 4: Simplify right side
    39,720.95x = 1,195,858,594.43
  5. Step 5: Solve for x
    x = 1,195,858,594.43/39,720.95
  6. Step 6: Final answer
    x = 30,106.50

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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.