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Finding the Fourth Proportional to 829.32, 1,243.50 and 342.72

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Solution

The fourth proportional to 829.32, 1,243.50 and 342.72 is: 513.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.32 : 1,243.50 = 342.72 : x
  2. Step 2: Convert to fraction form
    829.32/1,243.50 = 342.72/x
  3. Step 3: Cross multiply
    829.32x = 1,243.50 × 342.72
  4. Step 4: Simplify right side
    829.32x = 426,172.32
  5. Step 5: Solve for x
    x = 426,172.32/829.32
  6. Step 6: Final answer
    x = 513.88

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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.