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Finding the Fourth Proportional to 672.21, 927.41 and 439.65

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Solution

The fourth proportional to 672.21, 927.41 and 439.65 is: 606.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.21 : 927.41 = 439.65 : x
  2. Step 2: Convert to fraction form
    672.21/927.41 = 439.65/x
  3. Step 3: Cross multiply
    672.21x = 927.41 × 439.65
  4. Step 4: Simplify right side
    672.21x = 407,733.61
  5. Step 5: Solve for x
    x = 407,733.61/672.21
  6. Step 6: Final answer
    x = 606.56

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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.