Home / 20,986.94-28,960.66-11,555.50

Finding the Fourth Proportional to 20,986.94, 28,960.66 and 11,555.50

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Solution

The fourth proportional to 20,986.94, 28,960.66 and 11,555.50 is: 15,945.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.94 : 28,960.66 = 11,555.50 : x
  2. Step 2: Convert to fraction form
    20,986.94/28,960.66 = 11,555.50/x
  3. Step 3: Cross multiply
    20,986.94x = 28,960.66 × 11,555.50
  4. Step 4: Simplify right side
    20,986.94x = 334,654,906.63
  5. Step 5: Solve for x
    x = 334,654,906.63/20,986.94
  6. Step 6: Final answer
    x = 15,945.86

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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.