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Finding the Fourth Proportional to 259,128.90, 388,806.21 and 90,770.22

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Solution

The fourth proportional to 259,128.90, 388,806.21 and 90,770.22 is: 136,194.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,128.90 : 388,806.21 = 90,770.22 : x
  2. Step 2: Convert to fraction form
    259,128.90/388,806.21 = 90,770.22/x
  3. Step 3: Cross multiply
    259,128.90x = 388,806.21 × 90,770.22
  4. Step 4: Simplify right side
    259,128.90x = 35,292,025,219.07
  5. Step 5: Solve for x
    x = 35,292,025,219.07/259,128.90
  6. Step 6: Final answer
    x = 136,194.86

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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.