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Finding the Fourth Proportional to 405,843.80, 608,765.70 and 386,490.20

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Solution

The fourth proportional to 405,843.80, 608,765.70 and 386,490.20 is: 579,735.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,843.80 : 608,765.70 = 386,490.20 : x
  2. Step 2: Convert to fraction form
    405,843.80/608,765.70 = 386,490.20/x
  3. Step 3: Cross multiply
    405,843.80x = 608,765.70 × 386,490.20
  4. Step 4: Simplify right side
    405,843.80x = 235,281,977,146.14
  5. Step 5: Solve for x
    x = 235,281,977,146.14/405,843.80
  6. Step 6: Final answer
    x = 579,735.30

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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.