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Finding the Fourth Proportional to 715,996.88, 988,091.72 and 393,686.48

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Solution

The fourth proportional to 715,996.88, 988,091.72 and 393,686.48 is: 543,296.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,996.88 : 988,091.72 = 393,686.48 : x
  2. Step 2: Convert to fraction form
    715,996.88/988,091.72 = 393,686.48/x
  3. Step 3: Cross multiply
    715,996.88x = 988,091.72 × 393,686.48
  4. Step 4: Simplify right side
    715,996.88x = 388,998,351,163.95
  5. Step 5: Solve for x
    x = 388,998,351,163.95/715,996.88
  6. Step 6: Final answer
    x = 543,296.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.