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Finding the Fourth Proportional to 639,319.20, 957,289.20 and 512,368.80

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Solution

The fourth proportional to 639,319.20, 957,289.20 and 512,368.80 is: 767,199.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,319.20 : 957,289.20 = 512,368.80 : x
  2. Step 2: Convert to fraction form
    639,319.20/957,289.20 = 512,368.80/x
  3. Step 3: Cross multiply
    639,319.20x = 957,289.20 × 512,368.80
  4. Step 4: Simplify right side
    639,319.20x = 490,485,118,656.96
  5. Step 5: Solve for x
    x = 490,485,118,656.96/639,319.20
  6. Step 6: Final answer
    x = 767,199.11

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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.