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Finding the Fourth Proportional to 621,695,969.90, 858,015,670.08 and 353,836,928.61

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Solution

The fourth proportional to 621,695,969.90, 858,015,670.08 and 353,836,928.61 is: 488,337,779.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,695,969.90 : 858,015,670.08 = 353,836,928.61 : x
  2. Step 2: Convert to fraction form
    621,695,969.90/858,015,670.08 = 353,836,928.61/x
  3. Step 3: Cross multiply
    621,695,969.90x = 858,015,670.08 × 353,836,928.61
  4. Step 4: Simplify right side
    621,695,969.90x = 303,597,629,401,685,184
  5. Step 5: Solve for x
    x = 303,597,629,401,685,184/621,695,969.90
  6. Step 6: Final answer
    x = 488,337,779.40

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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.