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Finding the Fourth Proportional to 261,628.88, 391,758.16 and 171,387.69

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Solution

The fourth proportional to 261,628.88, 391,758.16 and 171,387.69 is: 256,632.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,628.88 : 391,758.16 = 171,387.69 : x
  2. Step 2: Convert to fraction form
    261,628.88/391,758.16 = 171,387.69/x
  3. Step 3: Cross multiply
    261,628.88x = 391,758.16 × 171,387.69
  4. Step 4: Simplify right side
    261,628.88x = 67,142,526,081.05
  5. Step 5: Solve for x
    x = 67,142,526,081.05/261,628.88
  6. Step 6: Final answer
    x = 256,632.70

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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.