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Finding the Fourth Proportional to 715,885.96, 987,897.38 and 393,593.56

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Solution

The fourth proportional to 715,885.96, 987,897.38 and 393,593.56 is: 543,145.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,885.96 : 987,897.38 = 393,593.56 : x
  2. Step 2: Convert to fraction form
    715,885.96/987,897.38 = 393,593.56/x
  3. Step 3: Cross multiply
    715,885.96x = 987,897.38 × 393,593.56
  4. Step 4: Simplify right side
    715,885.96x = 388,830,046,708.87
  5. Step 5: Solve for x
    x = 388,830,046,708.87/715,885.96
  6. Step 6: Final answer
    x = 543,145.23

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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.