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Finding the Fourth Proportional to 996.43, 1,370.15 and 885.70

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Solution

The fourth proportional to 996.43, 1,370.15 and 885.70 is: 1,217.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.43 : 1,370.15 = 885.70 : x
  2. Step 2: Convert to fraction form
    996.43/1,370.15 = 885.70/x
  3. Step 3: Cross multiply
    996.43x = 1,370.15 × 885.70
  4. Step 4: Simplify right side
    996.43x = 1,213,537.43
  5. Step 5: Solve for x
    x = 1,213,537.43/996.43
  6. Step 6: Final answer
    x = 1,217.89

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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.