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Finding the Fourth Proportional to 39,863.63, 55,009.78 and 21,958.25

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Solution

The fourth proportional to 39,863.63, 55,009.78 and 21,958.25 is: 30,301.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,863.63 : 55,009.78 = 21,958.25 : x
  2. Step 2: Convert to fraction form
    39,863.63/55,009.78 = 21,958.25/x
  3. Step 3: Cross multiply
    39,863.63x = 55,009.78 × 21,958.25
  4. Step 4: Simplify right side
    39,863.63x = 1,207,918,501.69
  5. Step 5: Solve for x
    x = 1,207,918,501.69/39,863.63
  6. Step 6: Final answer
    x = 30,301.27

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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.