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Finding the Fourth Proportional to 829.28, 1,243.15 and 281.08

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Solution

The fourth proportional to 829.28, 1,243.15 and 281.08 is: 421.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.28 : 1,243.15 = 281.08 : x
  2. Step 2: Convert to fraction form
    829.28/1,243.15 = 281.08/x
  3. Step 3: Cross multiply
    829.28x = 1,243.15 × 281.08
  4. Step 4: Simplify right side
    829.28x = 349,424.60
  5. Step 5: Solve for x
    x = 349,424.60/829.28
  6. Step 6: Final answer
    x = 421.36

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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.