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Finding the Fourth Proportional to 818.76, 1,227.56 and 422.46

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Solution

The fourth proportional to 818.76, 1,227.56 and 422.46 is: 633.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.76 : 1,227.56 = 422.46 : x
  2. Step 2: Convert to fraction form
    818.76/1,227.56 = 422.46/x
  3. Step 3: Cross multiply
    818.76x = 1,227.56 × 422.46
  4. Step 4: Simplify right side
    818.76x = 518,592.89
  5. Step 5: Solve for x
    x = 518,592.89/818.76
  6. Step 6: Final answer
    x = 633.39

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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.