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Finding the Fourth Proportional to 715,586.81, 987,506.78 and 393,310.49

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Solution

The fourth proportional to 715,586.81, 987,506.78 and 393,310.49 is: 542,766.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,586.81 : 987,506.78 = 393,310.49 : x
  2. Step 2: Convert to fraction form
    715,586.81/987,506.78 = 393,310.49/x
  3. Step 3: Cross multiply
    715,586.81x = 987,506.78 × 393,310.49
  4. Step 4: Simplify right side
    715,586.81x = 388,396,768,616.04
  5. Step 5: Solve for x
    x = 388,396,768,616.04/715,586.81
  6. Step 6: Final answer
    x = 542,766.81

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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.