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Finding the Fourth Proportional to 258,720.39, 388,080.60 and 71,731.89

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Solution

The fourth proportional to 258,720.39, 388,080.60 and 71,731.89 is: 107,597.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,720.39 : 388,080.60 = 71,731.89 : x
  2. Step 2: Convert to fraction form
    258,720.39/388,080.60 = 71,731.89/x
  3. Step 3: Cross multiply
    258,720.39x = 388,080.60 × 71,731.89
  4. Step 4: Simplify right side
    258,720.39x = 27,837,754,910.33
  5. Step 5: Solve for x
    x = 27,837,754,910.33/258,720.39
  6. Step 6: Final answer
    x = 107,597.84

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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.