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Finding the Fourth Proportional to 639,441.80, 959,162.70 and 612,139.40

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Solution

The fourth proportional to 639,441.80, 959,162.70 and 612,139.40 is: 918,209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,441.80 : 959,162.70 = 612,139.40 : x
  2. Step 2: Convert to fraction form
    639,441.80/959,162.70 = 612,139.40/x
  3. Step 3: Cross multiply
    639,441.80x = 959,162.70 × 612,139.40
  4. Step 4: Simplify right side
    639,441.80x = 587,141,279,680.38
  5. Step 5: Solve for x
    x = 587,141,279,680.38/639,441.80
  6. Step 6: Final answer
    x = 918,209.10

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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.