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Finding the Fourth Proportional to 818.07, 1,227.31 and 385.13

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Solution

The fourth proportional to 818.07, 1,227.31 and 385.13 is: 577.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.07 : 1,227.31 = 385.13 : x
  2. Step 2: Convert to fraction form
    818.07/1,227.31 = 385.13/x
  3. Step 3: Cross multiply
    818.07x = 1,227.31 × 385.13
  4. Step 4: Simplify right side
    818.07x = 472,666.80
  5. Step 5: Solve for x
    x = 472,666.80/818.07
  6. Step 6: Final answer
    x = 577.78

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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.