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Finding the Fourth Proportional to 39,350, 54,303 and 21,686

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Solution

The fourth proportional to 39,350, 54,303 and 21,686 is: 29,926.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,350 : 54,303 = 21,686 : x
  2. Step 2: Convert to fraction form
    39,350/54,303 = 21,686/x
  3. Step 3: Cross multiply
    39,350x = 54,303 × 21,686
  4. Step 4: Simplify right side
    39,350x = 1,177,614,858
  5. Step 5: Solve for x
    x = 1,177,614,858/39,350
  6. Step 6: Final answer
    x = 29,926.68

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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.