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Finding the Fourth Proportional to 521,943.78, 782,915.68 and 127,959.78

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Solution

The fourth proportional to 521,943.78, 782,915.68 and 127,959.78 is: 191,939.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,943.78 : 782,915.68 = 127,959.78 : x
  2. Step 2: Convert to fraction form
    521,943.78/782,915.68 = 127,959.78/x
  3. Step 3: Cross multiply
    521,943.78x = 782,915.68 × 127,959.78
  4. Step 4: Simplify right side
    521,943.78x = 100,181,718,171.35
  5. Step 5: Solve for x
    x = 100,181,718,171.35/521,943.78
  6. Step 6: Final answer
    x = 191,939.67

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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.