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Finding the Fourth Proportional to 405,830.80, 608,746.20 and 398,832.40

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Solution

The fourth proportional to 405,830.80, 608,746.20 and 398,832.40 is: 598,248.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,830.80 : 608,746.20 = 398,832.40 : x
  2. Step 2: Convert to fraction form
    405,830.80/608,746.20 = 398,832.40/x
  3. Step 3: Cross multiply
    405,830.80x = 608,746.20 × 398,832.40
  4. Step 4: Simplify right side
    405,830.80x = 242,787,707,936.88
  5. Step 5: Solve for x
    x = 242,787,707,936.88/405,830.80
  6. Step 6: Final answer
    x = 598,248.60

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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.