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Finding the Fourth Proportional to 18,927.13, 26,091.43 and 12,120.43

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Solution

The fourth proportional to 18,927.13, 26,091.43 and 12,120.43 is: 16,708.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,927.13 : 26,091.43 = 12,120.43 : x
  2. Step 2: Convert to fraction form
    18,927.13/26,091.43 = 12,120.43/x
  3. Step 3: Cross multiply
    18,927.13x = 26,091.43 × 12,120.43
  4. Step 4: Simplify right side
    18,927.13x = 316,239,350.91
  5. Step 5: Solve for x
    x = 316,239,350.91/18,927.13
  6. Step 6: Final answer
    x = 16,708.26

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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.