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Finding the Fourth Proportional to 672.09, 926.37 and 485.31

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Solution

The fourth proportional to 672.09, 926.37 and 485.31 is: 668.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.09 : 926.37 = 485.31 : x
  2. Step 2: Convert to fraction form
    672.09/926.37 = 485.31/x
  3. Step 3: Cross multiply
    672.09x = 926.37 × 485.31
  4. Step 4: Simplify right side
    672.09x = 449,576.62
  5. Step 5: Solve for x
    x = 449,576.62/672.09
  6. Step 6: Final answer
    x = 668.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.