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Finding the Fourth Proportional to 639,564.40, 959,346.60 and 459,938.80

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Solution

The fourth proportional to 639,564.40, 959,346.60 and 459,938.80 is: 689,908.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,564.40 : 959,346.60 = 459,938.80 : x
  2. Step 2: Convert to fraction form
    639,564.40/959,346.60 = 459,938.80/x
  3. Step 3: Cross multiply
    639,564.40x = 959,346.60 × 459,938.80
  4. Step 4: Simplify right side
    639,564.40x = 441,240,723,988.08
  5. Step 5: Solve for x
    x = 441,240,723,988.08/639,564.40
  6. Step 6: Final answer
    x = 689,908.20

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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.