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Finding the Fourth Proportional to 639,338.60, 959,007.90 and 266,090.60

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Solution

The fourth proportional to 639,338.60, 959,007.90 and 266,090.60 is: 399,135.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,338.60 : 959,007.90 = 266,090.60 : x
  2. Step 2: Convert to fraction form
    639,338.60/959,007.90 = 266,090.60/x
  3. Step 3: Cross multiply
    639,338.60x = 959,007.90 × 266,090.60
  4. Step 4: Simplify right side
    639,338.60x = 255,182,987,515.74
  5. Step 5: Solve for x
    x = 255,182,987,515.74/639,338.60
  6. Step 6: Final answer
    x = 399,135.90

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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.