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Finding the Fourth Proportional to 715,859.78, 987,893.25 and 393,572.12

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Solution

The fourth proportional to 715,859.78, 987,893.25 and 393,572.12 is: 543,133.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,859.78 : 987,893.25 = 393,572.12 : x
  2. Step 2: Convert to fraction form
    715,859.78/987,893.25 = 393,572.12/x
  3. Step 3: Cross multiply
    715,859.78x = 987,893.25 × 393,572.12
  4. Step 4: Simplify right side
    715,859.78x = 388,807,240,736.19
  5. Step 5: Solve for x
    x = 388,807,240,736.19/715,859.78
  6. Step 6: Final answer
    x = 543,133.24

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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.