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Finding the Fourth Proportional to 931.21, 1,396.86 and 281.95

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Solution

The fourth proportional to 931.21, 1,396.86 and 281.95 is: 422.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.21 : 1,396.86 = 281.95 : x
  2. Step 2: Convert to fraction form
    931.21/1,396.86 = 281.95/x
  3. Step 3: Cross multiply
    931.21x = 1,396.86 × 281.95
  4. Step 4: Simplify right side
    931.21x = 393,844.68
  5. Step 5: Solve for x
    x = 393,844.68/931.21
  6. Step 6: Final answer
    x = 422.94

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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.