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Finding the Fourth Proportional to 39,609.50, 54,661.11 and 21,945.50

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Solution

The fourth proportional to 39,609.50, 54,661.11 and 21,945.50 is: 30,284.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,609.50 : 54,661.11 = 21,945.50 : x
  2. Step 2: Convert to fraction form
    39,609.50/54,661.11 = 21,945.50/x
  3. Step 3: Cross multiply
    39,609.50x = 54,661.11 × 21,945.50
  4. Step 4: Simplify right side
    39,609.50x = 1,199,565,389.51
  5. Step 5: Solve for x
    x = 1,199,565,389.51/39,609.50
  6. Step 6: Final answer
    x = 30,284.79

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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.