Home / 20,971.80-28,940.40-11,540.34

Finding the Fourth Proportional to 20,971.80, 28,940.40 and 11,540.34

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Solution

The fourth proportional to 20,971.80, 28,940.40 and 11,540.34 is: 15,925.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.80 : 28,940.40 = 11,540.34 : x
  2. Step 2: Convert to fraction form
    20,971.80/28,940.40 = 11,540.34/x
  3. Step 3: Cross multiply
    20,971.80x = 28,940.40 × 11,540.34
  4. Step 4: Simplify right side
    20,971.80x = 333,982,055.74
  5. Step 5: Solve for x
    x = 333,982,055.74/20,971.80
  6. Step 6: Final answer
    x = 15,925.29

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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.