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Finding the Fourth Proportional to 639,239.71, 958,185.51 and 212,661.60

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Solution

The fourth proportional to 639,239.71, 958,185.51 and 212,661.60 is: 318,768.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,239.71 : 958,185.51 = 212,661.60 : x
  2. Step 2: Convert to fraction form
    639,239.71/958,185.51 = 212,661.60/x
  3. Step 3: Cross multiply
    639,239.71x = 958,185.51 × 212,661.60
  4. Step 4: Simplify right side
    639,239.71x = 203,769,263,653.42
  5. Step 5: Solve for x
    x = 203,769,263,653.42/639,239.71
  6. Step 6: Final answer
    x = 318,768.16

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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.