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Finding the Fourth Proportional to 728.18, 1,003.83 and 553.22

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Solution

The fourth proportional to 728.18, 1,003.83 and 553.22 is: 762.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.18 : 1,003.83 = 553.22 : x
  2. Step 2: Convert to fraction form
    728.18/1,003.83 = 553.22/x
  3. Step 3: Cross multiply
    728.18x = 1,003.83 × 553.22
  4. Step 4: Simplify right side
    728.18x = 555,338.83
  5. Step 5: Solve for x
    x = 555,338.83/728.18
  6. Step 6: Final answer
    x = 762.64

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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.