Home / 20,971.44-28,940.58-11,540

Finding the Fourth Proportional to 20,971.44, 28,940.58 and 11,540

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Solution

The fourth proportional to 20,971.44, 28,940.58 and 11,540 is: 15,925.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.44 : 28,940.58 = 11,540 : x
  2. Step 2: Convert to fraction form
    20,971.44/28,940.58 = 11,540/x
  3. Step 3: Cross multiply
    20,971.44x = 28,940.58 × 11,540
  4. Step 4: Simplify right side
    20,971.44x = 333,974,293.20
  5. Step 5: Solve for x
    x = 333,974,293.20/20,971.44
  6. Step 6: Final answer
    x = 15,925.20

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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.