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Finding the Fourth Proportional to 65,866,986.94, 90,866,634.04 and 39,753,157.18

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Solution

The fourth proportional to 65,866,986.94, 90,866,634.04 and 39,753,157.18 is: 54,841,366.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,866,986.94 : 90,866,634.04 = 39,753,157.18 : x
  2. Step 2: Convert to fraction form
    65,866,986.94/90,866,634.04 = 39,753,157.18/x
  3. Step 3: Cross multiply
    65,866,986.94x = 90,866,634.04 × 39,753,157.18
  4. Step 4: Simplify right side
    65,866,986.94x = 3,612,235,585,083,109
  5. Step 5: Solve for x
    x = 3,612,235,585,083,109/65,866,986.94
  6. Step 6: Final answer
    x = 54,841,366.72

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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.