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Finding the Fourth Proportional to 930.85, 1,396.29 and 281.58

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Solution

The fourth proportional to 930.85, 1,396.29 and 281.58 is: 422.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.85 : 1,396.29 = 281.58 : x
  2. Step 2: Convert to fraction form
    930.85/1,396.29 = 281.58/x
  3. Step 3: Cross multiply
    930.85x = 1,396.29 × 281.58
  4. Step 4: Simplify right side
    930.85x = 393,168.39
  5. Step 5: Solve for x
    x = 393,168.39/930.85
  6. Step 6: Final answer
    x = 422.38

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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.