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Finding the Fourth Proportional to 664,986.85, 917,687.72 and 378,525.38

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Solution

The fourth proportional to 664,986.85, 917,687.72 and 378,525.38 is: 522,368.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,986.85 : 917,687.72 = 378,525.38 : x
  2. Step 2: Convert to fraction form
    664,986.85/917,687.72 = 378,525.38/x
  3. Step 3: Cross multiply
    664,986.85x = 917,687.72 × 378,525.38
  4. Step 4: Simplify right side
    664,986.85x = 347,368,092,934.33
  5. Step 5: Solve for x
    x = 347,368,092,934.33/664,986.85
  6. Step 6: Final answer
    x = 522,368.36

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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.