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Finding the Fourth Proportional to 39,861.97, 55,012.01 and 21,956.97

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Solution

The fourth proportional to 39,861.97, 55,012.01 and 21,956.97 is: 30,301.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,861.97 : 55,012.01 = 21,956.97 : x
  2. Step 2: Convert to fraction form
    39,861.97/55,012.01 = 21,956.97/x
  3. Step 3: Cross multiply
    39,861.97x = 55,012.01 × 21,956.97
  4. Step 4: Simplify right side
    39,861.97x = 1,207,897,053.21
  5. Step 5: Solve for x
    x = 1,207,897,053.21/39,861.97
  6. Step 6: Final answer
    x = 30,301.99

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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.