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Finding the Fourth Proportional to 691,756, 954,637.86 and 389,950

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Solution

The fourth proportional to 691,756, 954,637.86 and 389,950 is: 538,139.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,756 : 954,637.86 = 389,950 : x
  2. Step 2: Convert to fraction form
    691,756/954,637.86 = 389,950/x
  3. Step 3: Cross multiply
    691,756x = 954,637.86 × 389,950
  4. Step 4: Simplify right side
    691,756x = 372,261,033,507
  5. Step 5: Solve for x
    x = 372,261,033,507/691,756
  6. Step 6: Final answer
    x = 538,139.22

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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.