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Finding the Fourth Proportional to 39,716.51, 54,809.74 and 21,811.90

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Solution

The fourth proportional to 39,716.51, 54,809.74 and 21,811.90 is: 30,100.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,716.51 : 54,809.74 = 21,811.90 : x
  2. Step 2: Convert to fraction form
    39,716.51/54,809.74 = 21,811.90/x
  3. Step 3: Cross multiply
    39,716.51x = 54,809.74 × 21,811.90
  4. Step 4: Simplify right side
    39,716.51x = 1,195,504,438.22
  5. Step 5: Solve for x
    x = 1,195,504,438.22/39,716.51
  6. Step 6: Final answer
    x = 30,100.94

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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.