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Finding the Fourth Proportional to 715,866.28, 987,902.22 and 393,578.62

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Solution

The fourth proportional to 715,866.28, 987,902.22 and 393,578.62 is: 543,142.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,866.28 : 987,902.22 = 393,578.62 : x
  2. Step 2: Convert to fraction form
    715,866.28/987,902.22 = 393,578.62/x
  3. Step 3: Cross multiply
    715,866.28x = 987,902.22 × 393,578.62
  4. Step 4: Simplify right side
    715,866.28x = 388,817,192,442.54
  5. Step 5: Solve for x
    x = 388,817,192,442.54/715,866.28
  6. Step 6: Final answer
    x = 543,142.21

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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.