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Finding the Fourth Proportional to 258,671.32, 388,072.56 and 81,179.84

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Solution

The fourth proportional to 258,671.32, 388,072.56 and 81,179.84 is: 121,790.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,671.32 : 388,072.56 = 81,179.84 : x
  2. Step 2: Convert to fraction form
    258,671.32/388,072.56 = 81,179.84/x
  3. Step 3: Cross multiply
    258,671.32x = 388,072.56 × 81,179.84
  4. Step 4: Simplify right side
    258,671.32x = 31,503,668,329.19
  5. Step 5: Solve for x
    x = 31,503,668,329.19/258,671.32
  6. Step 6: Final answer
    x = 121,790.34

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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.