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Finding the Fourth Proportional to 1,220.20, 1,683.80 and 722.88

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Solution

The fourth proportional to 1,220.20, 1,683.80 and 722.88 is: 997.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.20 : 1,683.80 = 722.88 : x
  2. Step 2: Convert to fraction form
    1,220.20/1,683.80 = 722.88/x
  3. Step 3: Cross multiply
    1,220.20x = 1,683.80 × 722.88
  4. Step 4: Simplify right side
    1,220.20x = 1,217,187.15
  5. Step 5: Solve for x
    x = 1,217,187.15/1,220.20
  6. Step 6: Final answer
    x = 997.53

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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.