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Finding the Fourth Proportional to 39,888.43, 55,043.55 and 21,982.43

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Solution

The fourth proportional to 39,888.43, 55,043.55 and 21,982.43 is: 30,334.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,888.43 : 55,043.55 = 21,982.43 : x
  2. Step 2: Convert to fraction form
    39,888.43/55,043.55 = 21,982.43/x
  3. Step 3: Cross multiply
    39,888.43x = 55,043.55 × 21,982.43
  4. Step 4: Simplify right side
    39,888.43x = 1,209,990,874.91
  5. Step 5: Solve for x
    x = 1,209,990,874.91/39,888.43
  6. Step 6: Final answer
    x = 30,334.39

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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.