Home / 21,890.43-30,201.77-12,940.94

Finding the Fourth Proportional to 21,890.43, 30,201.77 and 12,940.94

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Solution

The fourth proportional to 21,890.43, 30,201.77 and 12,940.94 is: 17,854.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,890.43 : 30,201.77 = 12,940.94 : x
  2. Step 2: Convert to fraction form
    21,890.43/30,201.77 = 12,940.94/x
  3. Step 3: Cross multiply
    21,890.43x = 30,201.77 × 12,940.94
  4. Step 4: Simplify right side
    21,890.43x = 390,839,077.75
  5. Step 5: Solve for x
    x = 390,839,077.75/21,890.43
  6. Step 6: Final answer
    x = 17,854.34

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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.