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Finding the Fourth Proportional to 1,220.26, 1,683.72 and 722.52

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Solution

The fourth proportional to 1,220.26, 1,683.72 and 722.52 is: 996.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.26 : 1,683.72 = 722.52 : x
  2. Step 2: Convert to fraction form
    1,220.26/1,683.72 = 722.52/x
  3. Step 3: Cross multiply
    1,220.26x = 1,683.72 × 722.52
  4. Step 4: Simplify right side
    1,220.26x = 1,216,521.37
  5. Step 5: Solve for x
    x = 1,216,521.37/1,220.26
  6. Step 6: Final answer
    x = 996.94

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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.