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Finding the Fourth Proportional to 1,219.53, 1,683.06 and 721.92

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Solution

The fourth proportional to 1,219.53, 1,683.06 and 721.92 is: 996.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.53 : 1,683.06 = 721.92 : x
  2. Step 2: Convert to fraction form
    1,219.53/1,683.06 = 721.92/x
  3. Step 3: Cross multiply
    1,219.53x = 1,683.06 × 721.92
  4. Step 4: Simplify right side
    1,219.53x = 1,215,034.68
  5. Step 5: Solve for x
    x = 1,215,034.68/1,219.53
  6. Step 6: Final answer
    x = 996.31

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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.