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Finding the Fourth Proportional to 641,920.63, 885,839.63 and 355,434.56

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Solution

The fourth proportional to 641,920.63, 885,839.63 and 355,434.56 is: 490,493.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,920.63 : 885,839.63 = 355,434.56 : x
  2. Step 2: Convert to fraction form
    641,920.63/885,839.63 = 355,434.56/x
  3. Step 3: Cross multiply
    641,920.63x = 885,839.63 × 355,434.56
  4. Step 4: Simplify right side
    641,920.63x = 314,858,019,119.61
  5. Step 5: Solve for x
    x = 314,858,019,119.61/641,920.63
  6. Step 6: Final answer
    x = 490,493.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.