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Finding the Fourth Proportional to 896.63, 1,344.92 and 280.31

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Solution

The fourth proportional to 896.63, 1,344.92 and 280.31 is: 420.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.63 : 1,344.92 = 280.31 : x
  2. Step 2: Convert to fraction form
    896.63/1,344.92 = 280.31/x
  3. Step 3: Cross multiply
    896.63x = 1,344.92 × 280.31
  4. Step 4: Simplify right side
    896.63x = 376,986.40
  5. Step 5: Solve for x
    x = 376,986.40/896.63
  6. Step 6: Final answer
    x = 420.45

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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.