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Finding the Fourth Proportional to 383,910.80, 575,866.20 and 257,939.60

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Solution

The fourth proportional to 383,910.80, 575,866.20 and 257,939.60 is: 386,909.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    383,910.80 : 575,866.20 = 257,939.60 : x
  2. Step 2: Convert to fraction form
    383,910.80/575,866.20 = 257,939.60/x
  3. Step 3: Cross multiply
    383,910.80x = 575,866.20 × 257,939.60
  4. Step 4: Simplify right side
    383,910.80x = 148,538,697,281.52
  5. Step 5: Solve for x
    x = 148,538,697,281.52/383,910.80
  6. Step 6: Final answer
    x = 386,909.40

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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.