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Finding the Fourth Proportional to 684.87, 1,027.31 and 274.38

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Solution

The fourth proportional to 684.87, 1,027.31 and 274.38 is: 411.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.87 : 1,027.31 = 274.38 : x
  2. Step 2: Convert to fraction form
    684.87/1,027.31 = 274.38/x
  3. Step 3: Cross multiply
    684.87x = 1,027.31 × 274.38
  4. Step 4: Simplify right side
    684.87x = 281,871.95
  5. Step 5: Solve for x
    x = 281,871.95/684.87
  6. Step 6: Final answer
    x = 411.57

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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.