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Finding the Fourth Proportional to 640,999.96, 961,501.57 and 261,920.69

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Solution

The fourth proportional to 640,999.96, 961,501.57 and 261,920.69 is: 392,881.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,999.96 : 961,501.57 = 261,920.69 : x
  2. Step 2: Convert to fraction form
    640,999.96/961,501.57 = 261,920.69/x
  3. Step 3: Cross multiply
    640,999.96x = 961,501.57 × 261,920.69
  4. Step 4: Simplify right side
    640,999.96x = 251,837,153,340.88
  5. Step 5: Solve for x
    x = 251,837,153,340.88/640,999.96
  6. Step 6: Final answer
    x = 392,881.70

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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.