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Finding the Fourth Proportional to 1,219.75, 1,683.24 and 660.21

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Solution

The fourth proportional to 1,219.75, 1,683.24 and 660.21 is: 911.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.75 : 1,683.24 = 660.21 : x
  2. Step 2: Convert to fraction form
    1,219.75/1,683.24 = 660.21/x
  3. Step 3: Cross multiply
    1,219.75x = 1,683.24 × 660.21
  4. Step 4: Simplify right side
    1,219.75x = 1,111,288.58
  5. Step 5: Solve for x
    x = 1,111,288.58/1,219.75
  6. Step 6: Final answer
    x = 911.08

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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.