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Finding the Fourth Proportional to 815.56, 1,221.05 and 444.02

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Solution

The fourth proportional to 815.56, 1,221.05 and 444.02 is: 664.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.56 : 1,221.05 = 444.02 : x
  2. Step 2: Convert to fraction form
    815.56/1,221.05 = 444.02/x
  3. Step 3: Cross multiply
    815.56x = 1,221.05 × 444.02
  4. Step 4: Simplify right side
    815.56x = 542,165.63
  5. Step 5: Solve for x
    x = 542,165.63/815.56
  6. Step 6: Final answer
    x = 664.78

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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.