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Finding the Fourth Proportional to 39,609, 54,660.42 and 21,945

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Solution

The fourth proportional to 39,609, 54,660.42 and 21,945 is: 30,284.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,609 : 54,660.42 = 21,945 : x
  2. Step 2: Convert to fraction form
    39,609/54,660.42 = 21,945/x
  3. Step 3: Cross multiply
    39,609x = 54,660.42 × 21,945
  4. Step 4: Simplify right side
    39,609x = 1,199,522,916.90
  5. Step 5: Solve for x
    x = 1,199,522,916.90/39,609
  6. Step 6: Final answer
    x = 30,284.10

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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.