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Finding the Fourth Proportional to 639,309.60, 958,964.40 and 266,061.60

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Solution

The fourth proportional to 639,309.60, 958,964.40 and 266,061.60 is: 399,092.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,309.60 : 958,964.40 = 266,061.60 : x
  2. Step 2: Convert to fraction form
    639,309.60/958,964.40 = 266,061.60/x
  3. Step 3: Cross multiply
    639,309.60x = 958,964.40 × 266,061.60
  4. Step 4: Simplify right side
    639,309.60x = 255,143,602,607.04
  5. Step 5: Solve for x
    x = 255,143,602,607.04/639,309.60
  6. Step 6: Final answer
    x = 399,092.40

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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.