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Finding the Fourth Proportional to 818.39, 1,220.33 and 721.26

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Solution

The fourth proportional to 818.39, 1,220.33 and 721.26 is: 1,075.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.39 : 1,220.33 = 721.26 : x
  2. Step 2: Convert to fraction form
    818.39/1,220.33 = 721.26/x
  3. Step 3: Cross multiply
    818.39x = 1,220.33 × 721.26
  4. Step 4: Simplify right side
    818.39x = 880,177.02
  5. Step 5: Solve for x
    x = 880,177.02/818.39
  6. Step 6: Final answer
    x = 1,075.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.