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Finding the Fourth Proportional to 1,755, 2,632.56 and 831

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Solution

The fourth proportional to 1,755, 2,632.56 and 831 is: 1,246.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,755 : 2,632.56 = 831 : x
  2. Step 2: Convert to fraction form
    1,755/2,632.56 = 831/x
  3. Step 3: Cross multiply
    1,755x = 2,632.56 × 831
  4. Step 4: Simplify right side
    1,755x = 2,187,657.36
  5. Step 5: Solve for x
    x = 2,187,657.36/1,755
  6. Step 6: Final answer
    x = 1,246.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.