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Finding the Fourth Proportional to 39,809.72, 54,940.74 and 21,908.12

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Solution

The fourth proportional to 39,809.72, 54,940.74 and 21,908.12 is: 30,235.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,809.72 : 54,940.74 = 21,908.12 : x
  2. Step 2: Convert to fraction form
    39,809.72/54,940.74 = 21,908.12/x
  3. Step 3: Cross multiply
    39,809.72x = 54,940.74 × 21,908.12
  4. Step 4: Simplify right side
    39,809.72x = 1,203,648,324.81
  5. Step 5: Solve for x
    x = 1,203,648,324.81/39,809.72
  6. Step 6: Final answer
    x = 30,235.04

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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.