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Finding the Fourth Proportional to 1,777.61, 2,453.11 and 991.71

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Solution

The fourth proportional to 1,777.61, 2,453.11 and 991.71 is: 1,368.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,777.61 : 2,453.11 = 991.71 : x
  2. Step 2: Convert to fraction form
    1,777.61/2,453.11 = 991.71/x
  3. Step 3: Cross multiply
    1,777.61x = 2,453.11 × 991.71
  4. Step 4: Simplify right side
    1,777.61x = 2,432,771.24
  5. Step 5: Solve for x
    x = 2,432,771.24/1,777.61
  6. Step 6: Final answer
    x = 1,368.56

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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.