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Finding the Fourth Proportional to 65,866,991.54, 90,866,640.39 and 39,753,161.78

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Solution

The fourth proportional to 65,866,991.54, 90,866,640.39 and 39,753,161.78 is: 54,841,373.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,866,991.54 : 90,866,640.39 = 39,753,161.78 : x
  2. Step 2: Convert to fraction form
    65,866,991.54/90,866,640.39 = 39,753,161.78/x
  3. Step 3: Cross multiply
    65,866,991.54x = 90,866,640.39 × 39,753,161.78
  4. Step 4: Simplify right side
    65,866,991.54x = 3,612,236,255,828,752.50
  5. Step 5: Solve for x
    x = 3,612,236,255,828,752.50/65,866,991.54
  6. Step 6: Final answer
    x = 54,841,373.07

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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.