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Finding the Fourth Proportional to 623,745.80, 935,618.70 and 386,318.60

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Solution

The fourth proportional to 623,745.80, 935,618.70 and 386,318.60 is: 579,477.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    623,745.80 : 935,618.70 = 386,318.60 : x
  2. Step 2: Convert to fraction form
    623,745.80/935,618.70 = 386,318.60/x
  3. Step 3: Cross multiply
    623,745.80x = 935,618.70 × 386,318.60
  4. Step 4: Simplify right side
    623,745.80x = 361,446,906,317.82
  5. Step 5: Solve for x
    x = 361,446,906,317.82/623,745.80
  6. Step 6: Final answer
    x = 579,477.90

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Half scale
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Double scale
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Similar ratio
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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.