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Finding the Fourth Proportional to 261,168, 391,786.85 and 103,359.55

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Solution

The fourth proportional to 261,168, 391,786.85 and 103,359.55 is: 155,053.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,168 : 391,786.85 = 103,359.55 : x
  2. Step 2: Convert to fraction form
    261,168/391,786.85 = 103,359.55/x
  3. Step 3: Cross multiply
    261,168x = 391,786.85 × 103,359.55
  4. Step 4: Simplify right side
    261,168x = 40,494,912,511.92
  5. Step 5: Solve for x
    x = 40,494,912,511.92/261,168
  6. Step 6: Final answer
    x = 155,053.12

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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.