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Finding the Fourth Proportional to 715,907.97, 987,944.14 and 393,615.25

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Solution

The fourth proportional to 715,907.97, 987,944.14 and 393,615.25 is: 543,184.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,907.97 : 987,944.14 = 393,615.25 : x
  2. Step 2: Convert to fraction form
    715,907.97/987,944.14 = 393,615.25/x
  3. Step 3: Cross multiply
    715,907.97x = 987,944.14 × 393,615.25
  4. Step 4: Simplify right side
    715,907.97x = 388,869,877,674.29
  5. Step 5: Solve for x
    x = 388,869,877,674.29/715,907.97
  6. Step 6: Final answer
    x = 543,184.17

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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.