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Finding the Fourth Proportional to 661,698.80, 992,548.20 and 409,180.40

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Solution

The fourth proportional to 661,698.80, 992,548.20 and 409,180.40 is: 613,770.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,698.80 : 992,548.20 = 409,180.40 : x
  2. Step 2: Convert to fraction form
    661,698.80/992,548.20 = 409,180.40/x
  3. Step 3: Cross multiply
    661,698.80x = 992,548.20 × 409,180.40
  4. Step 4: Simplify right side
    661,698.80x = 406,131,269,495.28
  5. Step 5: Solve for x
    x = 406,131,269,495.28/661,698.80
  6. Step 6: Final answer
    x = 613,770.60

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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.