Home / 39,780.62-54,895.78-21,874.56

Finding the Fourth Proportional to 39,780.62, 54,895.78 and 21,874.56

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Solution

The fourth proportional to 39,780.62, 54,895.78 and 21,874.56 is: 30,186.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,780.62 : 54,895.78 = 21,874.56 : x
  2. Step 2: Convert to fraction form
    39,780.62/54,895.78 = 21,874.56/x
  3. Step 3: Cross multiply
    39,780.62x = 54,895.78 × 21,874.56
  4. Step 4: Simplify right side
    39,780.62x = 1,200,821,033.36
  5. Step 5: Solve for x
    x = 1,200,821,033.36/39,780.62
  6. Step 6: Final answer
    x = 30,186.08

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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.