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Finding the Fourth Proportional to 1,220.25, 1,683.95 and 660.73

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Solution

The fourth proportional to 1,220.25, 1,683.95 and 660.73 is: 911.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.25 : 1,683.95 = 660.73 : x
  2. Step 2: Convert to fraction form
    1,220.25/1,683.95 = 660.73/x
  3. Step 3: Cross multiply
    1,220.25x = 1,683.95 × 660.73
  4. Step 4: Simplify right side
    1,220.25x = 1,112,630.79
  5. Step 5: Solve for x
    x = 1,112,630.79/1,220.25
  6. Step 6: Final answer
    x = 911.80

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1.5x scale

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.