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Finding the Fourth Proportional to 259,339.92, 389,009.94 and 81,860.76

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Solution

The fourth proportional to 259,339.92, 389,009.94 and 81,860.76 is: 122,791.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,339.92 : 389,009.94 = 81,860.76 : x
  2. Step 2: Convert to fraction form
    259,339.92/389,009.94 = 81,860.76/x
  3. Step 3: Cross multiply
    259,339.92x = 389,009.94 × 81,860.76
  4. Step 4: Simplify right side
    259,339.92x = 31,844,649,335.95
  5. Step 5: Solve for x
    x = 31,844,649,335.95/259,339.92
  6. Step 6: Final answer
    x = 122,791.16

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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.