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Finding the Fourth Proportional to 829.64, 1,243.48 and 342.84

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Solution

The fourth proportional to 829.64, 1,243.48 and 342.84 is: 513.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.64 : 1,243.48 = 342.84 : x
  2. Step 2: Convert to fraction form
    829.64/1,243.48 = 342.84/x
  3. Step 3: Cross multiply
    829.64x = 1,243.48 × 342.84
  4. Step 4: Simplify right side
    829.64x = 426,314.68
  5. Step 5: Solve for x
    x = 426,314.68/829.64
  6. Step 6: Final answer
    x = 513.86

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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.