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Finding the Fourth Proportional to 818.56, 1,227.06 and 407.44

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Solution

The fourth proportional to 818.56, 1,227.06 and 407.44 is: 610.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.56 : 1,227.06 = 407.44 : x
  2. Step 2: Convert to fraction form
    818.56/1,227.06 = 407.44/x
  3. Step 3: Cross multiply
    818.56x = 1,227.06 × 407.44
  4. Step 4: Simplify right side
    818.56x = 499,953.33
  5. Step 5: Solve for x
    x = 499,953.33/818.56
  6. Step 6: Final answer
    x = 610.77

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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.