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Finding the Fourth Proportional to 259,781.28, 389,671.91 and 252,005.28

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Solution

The fourth proportional to 259,781.28, 389,671.91 and 252,005.28 is: 378,007.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,781.28 : 389,671.91 = 252,005.28 : x
  2. Step 2: Convert to fraction form
    259,781.28/389,671.91 = 252,005.28/x
  3. Step 3: Cross multiply
    259,781.28x = 389,671.91 × 252,005.28
  4. Step 4: Simplify right side
    259,781.28x = 98,199,377,469.34
  5. Step 5: Solve for x
    x = 98,199,377,469.34/259,781.28
  6. Step 6: Final answer
    x = 378,007.91

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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.