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Finding the Fourth Proportional to 829.32, 1,243.69 and 281.35

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Solution

The fourth proportional to 829.32, 1,243.69 and 281.35 is: 421.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.32 : 1,243.69 = 281.35 : x
  2. Step 2: Convert to fraction form
    829.32/1,243.69 = 281.35/x
  3. Step 3: Cross multiply
    829.32x = 1,243.69 × 281.35
  4. Step 4: Simplify right side
    829.32x = 349,912.18
  5. Step 5: Solve for x
    x = 349,912.18/829.32
  6. Step 6: Final answer
    x = 421.93

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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.