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Finding the Fourth Proportional to 259,070.76, 388,620.01 and 81,591.59

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Solution

The fourth proportional to 259,070.76, 388,620.01 and 81,591.59 is: 122,391.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,070.76 : 388,620.01 = 81,591.59 : x
  2. Step 2: Convert to fraction form
    259,070.76/388,620.01 = 81,591.59/x
  3. Step 3: Cross multiply
    259,070.76x = 388,620.01 × 81,591.59
  4. Step 4: Simplify right side
    259,070.76x = 31,708,124,521.72
  5. Step 5: Solve for x
    x = 31,708,124,521.72/259,070.76
  6. Step 6: Final answer
    x = 122,391.75

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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.