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Finding the Fourth Proportional to 715,805.64, 987,812.55 and 393,521.22

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Solution

The fourth proportional to 715,805.64, 987,812.55 and 393,521.22 is: 543,059.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,805.64 : 987,812.55 = 393,521.22 : x
  2. Step 2: Convert to fraction form
    715,805.64/987,812.55 = 393,521.22/x
  3. Step 3: Cross multiply
    715,805.64x = 987,812.55 × 393,521.22
  4. Step 4: Simplify right side
    715,805.64x = 388,725,199,807.31
  5. Step 5: Solve for x
    x = 388,725,199,807.31/715,805.64
  6. Step 6: Final answer
    x = 543,059.71

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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.