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Finding the Fourth Proportional to 715,805.25, 987,830.11 and 393,523.46

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Solution

The fourth proportional to 715,805.25, 987,830.11 and 393,523.46 is: 543,072.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,805.25 : 987,830.11 = 393,523.46 : x
  2. Step 2: Convert to fraction form
    715,805.25/987,830.11 = 393,523.46/x
  3. Step 3: Cross multiply
    715,805.25x = 987,830.11 × 393,523.46
  4. Step 4: Simplify right side
    715,805.25x = 388,734,326,486.26
  5. Step 5: Solve for x
    x = 388,734,326,486.26/715,805.25
  6. Step 6: Final answer
    x = 543,072.75

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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.