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Finding the Fourth Proportional to 931.31, 1,396.45 and 281.96

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Solution

The fourth proportional to 931.31, 1,396.45 and 281.96 is: 422.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.31 : 1,396.45 = 281.96 : x
  2. Step 2: Convert to fraction form
    931.31/1,396.45 = 281.96/x
  3. Step 3: Cross multiply
    931.31x = 1,396.45 × 281.96
  4. Step 4: Simplify right side
    931.31x = 393,734.65
  5. Step 5: Solve for x
    x = 393,734.65/931.31
  6. Step 6: Final answer
    x = 422.78

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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.