Home / 21,930.78-30,262.23-12,976.56

Finding the Fourth Proportional to 21,930.78, 30,262.23 and 12,976.56

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Solution

The fourth proportional to 21,930.78, 30,262.23 and 12,976.56 is: 17,906.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,930.78 : 30,262.23 = 12,976.56 : x
  2. Step 2: Convert to fraction form
    21,930.78/30,262.23 = 12,976.56/x
  3. Step 3: Cross multiply
    21,930.78x = 30,262.23 × 12,976.56
  4. Step 4: Simplify right side
    21,930.78x = 392,699,643.33
  5. Step 5: Solve for x
    x = 392,699,643.33/21,930.78
  6. Step 6: Final answer
    x = 17,906.32

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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.