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Finding the Fourth Proportional to 996.29, 1,373.66 and 861.45

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Solution

The fourth proportional to 996.29, 1,373.66 and 861.45 is: 1,187.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.29 : 1,373.66 = 861.45 : x
  2. Step 2: Convert to fraction form
    996.29/1,373.66 = 861.45/x
  3. Step 3: Cross multiply
    996.29x = 1,373.66 × 861.45
  4. Step 4: Simplify right side
    996.29x = 1,183,335.10
  5. Step 5: Solve for x
    x = 1,183,335.10/996.29
  6. Step 6: Final answer
    x = 1,187.75

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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.