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Finding the Fourth Proportional to 20,786.94, 28,684.71 and 11,354.94

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Solution

The fourth proportional to 20,786.94, 28,684.71 and 11,354.94 is: 15,669.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,786.94 : 28,684.71 = 11,354.94 : x
  2. Step 2: Convert to fraction form
    20,786.94/28,684.71 = 11,354.94/x
  3. Step 3: Cross multiply
    20,786.94x = 28,684.71 × 11,354.94
  4. Step 4: Simplify right side
    20,786.94x = 325,713,160.97
  5. Step 5: Solve for x
    x = 325,713,160.97/20,786.94
  6. Step 6: Final answer
    x = 15,669.12

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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.