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Finding the Fourth Proportional to 259,739.38, 389,648.03 and 91,230

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Solution

The fourth proportional to 259,739.38, 389,648.03 and 91,230 is: 136,858.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,739.38 : 389,648.03 = 91,230 : x
  2. Step 2: Convert to fraction form
    259,739.38/389,648.03 = 91,230/x
  3. Step 3: Cross multiply
    259,739.38x = 389,648.03 × 91,230
  4. Step 4: Simplify right side
    259,739.38x = 35,547,589,320.75
  5. Step 5: Solve for x
    x = 35,547,589,320.75/259,739.38
  6. Step 6: Final answer
    x = 136,858.68

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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.