Home / 20,971.95-28,940.76-11,411.43

Finding the Fourth Proportional to 20,971.95, 28,940.76 and 11,411.43

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Solution

The fourth proportional to 20,971.95, 28,940.76 and 11,411.43 is: 15,747.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.95 : 28,940.76 = 11,411.43 : x
  2. Step 2: Convert to fraction form
    20,971.95/28,940.76 = 11,411.43/x
  3. Step 3: Cross multiply
    20,971.95x = 28,940.76 × 11,411.43
  4. Step 4: Simplify right side
    20,971.95x = 330,255,456.89
  5. Step 5: Solve for x
    x = 330,255,456.89/20,971.95
  6. Step 6: Final answer
    x = 15,747.48

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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.