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Finding the Fourth Proportional to 18,878.43, 28,256.02 and 13,879.48

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Solution

The fourth proportional to 18,878.43, 28,256.02 and 13,879.48 is: 20,773.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.43 : 28,256.02 = 13,879.48 : x
  2. Step 2: Convert to fraction form
    18,878.43/28,256.02 = 13,879.48/x
  3. Step 3: Cross multiply
    18,878.43x = 28,256.02 × 13,879.48
  4. Step 4: Simplify right side
    18,878.43x = 392,178,864.47
  5. Step 5: Solve for x
    x = 392,178,864.47/18,878.43
  6. Step 6: Final answer
    x = 20,773.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.