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Finding the Fourth Proportional to 20,969.63, 28,938.29 and 11,538.39

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Solution

The fourth proportional to 20,969.63, 28,938.29 and 11,538.39 is: 15,923.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.63 : 28,938.29 = 11,538.39 : x
  2. Step 2: Convert to fraction form
    20,969.63/28,938.29 = 11,538.39/x
  3. Step 3: Cross multiply
    20,969.63x = 28,938.29 × 11,538.39
  4. Step 4: Simplify right side
    20,969.63x = 333,901,218.26
  5. Step 5: Solve for x
    x = 333,901,218.26/20,969.63
  6. Step 6: Final answer
    x = 15,923.09

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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.