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Finding the Fourth Proportional to 691,765, 954,650.28 and 389,959

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Solution

The fourth proportional to 691,765, 954,650.28 and 389,959 is: 538,151.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,765 : 954,650.28 = 389,959 : x
  2. Step 2: Convert to fraction form
    691,765/954,650.28 = 389,959/x
  3. Step 3: Cross multiply
    691,765x = 954,650.28 × 389,959
  4. Step 4: Simplify right side
    691,765x = 372,274,468,538.52
  5. Step 5: Solve for x
    x = 372,274,468,538.52/691,765
  6. Step 6: Final answer
    x = 538,151.64

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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.