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Finding the Fourth Proportional to 712.27, 1,068.31 and 279.73

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Solution

The fourth proportional to 712.27, 1,068.31 and 279.73 is: 419.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.27 : 1,068.31 = 279.73 : x
  2. Step 2: Convert to fraction form
    712.27/1,068.31 = 279.73/x
  3. Step 3: Cross multiply
    712.27x = 1,068.31 × 279.73
  4. Step 4: Simplify right side
    712.27x = 298,838.36
  5. Step 5: Solve for x
    x = 298,838.36/712.27
  6. Step 6: Final answer
    x = 419.56

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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.