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Finding the Fourth Proportional to 1,190.76, 1,642.92 and 993.96

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Solution

The fourth proportional to 1,190.76, 1,642.92 and 993.96 is: 1,371.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.76 : 1,642.92 = 993.96 : x
  2. Step 2: Convert to fraction form
    1,190.76/1,642.92 = 993.96/x
  3. Step 3: Cross multiply
    1,190.76x = 1,642.92 × 993.96
  4. Step 4: Simplify right side
    1,190.76x = 1,632,996.76
  5. Step 5: Solve for x
    x = 1,632,996.76/1,190.76
  6. Step 6: Final answer
    x = 1,371.39

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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.