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Finding the Fourth Proportional to 829.25, 1,243.10 and 281.05

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Solution

The fourth proportional to 829.25, 1,243.10 and 281.05 is: 421.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.25 : 1,243.10 = 281.05 : x
  2. Step 2: Convert to fraction form
    829.25/1,243.10 = 281.05/x
  3. Step 3: Cross multiply
    829.25x = 1,243.10 × 281.05
  4. Step 4: Simplify right side
    829.25x = 349,374.46
  5. Step 5: Solve for x
    x = 349,374.46/829.25
  6. Step 6: Final answer
    x = 421.31

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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.