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Finding the Fourth Proportional to 665,178.30, 917,946.90 and 378,698.40

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Solution

The fourth proportional to 665,178.30, 917,946.90 and 378,698.40 is: 522,604.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,178.30 : 917,946.90 = 378,698.40 : x
  2. Step 2: Convert to fraction form
    665,178.30/917,946.90 = 378,698.40/x
  3. Step 3: Cross multiply
    665,178.30x = 917,946.90 × 378,698.40
  4. Step 4: Simplify right side
    665,178.30x = 347,625,022,314.96
  5. Step 5: Solve for x
    x = 347,625,022,314.96/665,178.30
  6. Step 6: Final answer
    x = 522,604.27

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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.