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Finding the Fourth Proportional to 818.16, 1,227.78 and 433.68

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Solution

The fourth proportional to 818.16, 1,227.78 and 433.68 is: 650.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.16 : 1,227.78 = 433.68 : x
  2. Step 2: Convert to fraction form
    818.16/1,227.78 = 433.68/x
  3. Step 3: Cross multiply
    818.16x = 1,227.78 × 433.68
  4. Step 4: Simplify right side
    818.16x = 532,463.63
  5. Step 5: Solve for x
    x = 532,463.63/818.16
  6. Step 6: Final answer
    x = 650.81

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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.