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Finding the Fourth Proportional to 20,874.51, 28,804.01 and 11,921.38

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Solution

The fourth proportional to 20,874.51, 28,804.01 and 11,921.38 is: 16,449.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.51 : 28,804.01 = 11,921.38 : x
  2. Step 2: Convert to fraction form
    20,874.51/28,804.01 = 11,921.38/x
  3. Step 3: Cross multiply
    20,874.51x = 28,804.01 × 11,921.38
  4. Step 4: Simplify right side
    20,874.51x = 343,383,417.12
  5. Step 5: Solve for x
    x = 343,383,417.12/20,874.51
  6. Step 6: Final answer
    x = 16,449.89

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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.