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Finding the Fourth Proportional to 815.35, 1,221.54 and 727.87

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Solution

The fourth proportional to 815.35, 1,221.54 and 727.87 is: 1,090.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.35 : 1,221.54 = 727.87 : x
  2. Step 2: Convert to fraction form
    815.35/1,221.54 = 727.87/x
  3. Step 3: Cross multiply
    815.35x = 1,221.54 × 727.87
  4. Step 4: Simplify right side
    815.35x = 889,122.32
  5. Step 5: Solve for x
    x = 889,122.32/815.35
  6. Step 6: Final answer
    x = 1,090.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.