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Finding the Fourth Proportional to 405,844.40, 608,766.60 and 386,490.80

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Solution

The fourth proportional to 405,844.40, 608,766.60 and 386,490.80 is: 579,736.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,844.40 : 608,766.60 = 386,490.80 : x
  2. Step 2: Convert to fraction form
    405,844.40/608,766.60 = 386,490.80/x
  3. Step 3: Cross multiply
    405,844.40x = 608,766.60 × 386,490.80
  4. Step 4: Simplify right side
    405,844.40x = 235,282,690,247.28
  5. Step 5: Solve for x
    x = 235,282,690,247.28/405,844.40
  6. Step 6: Final answer
    x = 579,736.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.