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Finding the Fourth Proportional to 1,219.67, 1,682.88 and 721.97

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Solution

The fourth proportional to 1,219.67, 1,682.88 and 721.97 is: 996.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.67 : 1,682.88 = 721.97 : x
  2. Step 2: Convert to fraction form
    1,219.67/1,682.88 = 721.97/x
  3. Step 3: Cross multiply
    1,219.67x = 1,682.88 × 721.97
  4. Step 4: Simplify right side
    1,219.67x = 1,214,988.87
  5. Step 5: Solve for x
    x = 1,214,988.87/1,219.67
  6. Step 6: Final answer
    x = 996.16

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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.