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Finding the Fourth Proportional to 930.59, 1,396.11 and 281.32

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Solution

The fourth proportional to 930.59, 1,396.11 and 281.32 is: 422.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.59 : 1,396.11 = 281.32 : x
  2. Step 2: Convert to fraction form
    930.59/1,396.11 = 281.32/x
  3. Step 3: Cross multiply
    930.59x = 1,396.11 × 281.32
  4. Step 4: Simplify right side
    930.59x = 392,759.08
  5. Step 5: Solve for x
    x = 392,759.08/930.59
  6. Step 6: Final answer
    x = 422.05

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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.