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Finding the Fourth Proportional to 930.28, 1,395.36 and 280.96

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Solution

The fourth proportional to 930.28, 1,395.36 and 280.96 is: 421.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.28 : 1,395.36 = 280.96 : x
  2. Step 2: Convert to fraction form
    930.28/1,395.36 = 280.96/x
  3. Step 3: Cross multiply
    930.28x = 1,395.36 × 280.96
  4. Step 4: Simplify right side
    930.28x = 392,040.35
  5. Step 5: Solve for x
    x = 392,040.35/930.28
  6. Step 6: Final answer
    x = 421.42

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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.