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Finding the Fourth Proportional to 829.31, 1,243.80 and 418.68

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Solution

The fourth proportional to 829.31, 1,243.80 and 418.68 is: 627.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.31 : 1,243.80 = 418.68 : x
  2. Step 2: Convert to fraction form
    829.31/1,243.80 = 418.68/x
  3. Step 3: Cross multiply
    829.31x = 1,243.80 × 418.68
  4. Step 4: Simplify right side
    829.31x = 520,754.18
  5. Step 5: Solve for x
    x = 520,754.18/829.31
  6. Step 6: Final answer
    x = 627.94

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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.