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Finding the Fourth Proportional to 715,796.23, 987,817.67 and 393,514.45

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Solution

The fourth proportional to 715,796.23, 987,817.67 and 393,514.45 is: 543,060.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,796.23 : 987,817.67 = 393,514.45 : x
  2. Step 2: Convert to fraction form
    715,796.23/987,817.67 = 393,514.45/x
  3. Step 3: Cross multiply
    715,796.23x = 987,817.67 × 393,514.45
  4. Step 4: Simplify right side
    715,796.23x = 388,720,527,110.33
  5. Step 5: Solve for x
    x = 388,720,527,110.33/715,796.23
  6. Step 6: Final answer
    x = 543,060.32

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Double scale
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1.5x scale

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.