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Finding the Fourth Proportional to 39,391.44, 54,358.44 and 21,486

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Solution

The fourth proportional to 39,391.44, 54,358.44 and 21,486 is: 29,649.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,391.44 : 54,358.44 = 21,486 : x
  2. Step 2: Convert to fraction form
    39,391.44/54,358.44 = 21,486/x
  3. Step 3: Cross multiply
    39,391.44x = 54,358.44 × 21,486
  4. Step 4: Simplify right side
    39,391.44x = 1,167,945,441.84
  5. Step 5: Solve for x
    x = 1,167,945,441.84/39,391.44
  6. Step 6: Final answer
    x = 29,649.73

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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.