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Finding the Fourth Proportional to 931.10, 1,396.64 and 281.81

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Solution

The fourth proportional to 931.10, 1,396.64 and 281.81 is: 422.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.10 : 1,396.64 = 281.81 : x
  2. Step 2: Convert to fraction form
    931.10/1,396.64 = 281.81/x
  3. Step 3: Cross multiply
    931.10x = 1,396.64 × 281.81
  4. Step 4: Simplify right side
    931.10x = 393,591.31
  5. Step 5: Solve for x
    x = 393,591.31/931.10
  6. Step 6: Final answer
    x = 422.72

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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.