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Finding the Fourth Proportional to 439.58, 660.57 and 423.38

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Solution

The fourth proportional to 439.58, 660.57 and 423.38 is: 636.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.58 : 660.57 = 423.38 : x
  2. Step 2: Convert to fraction form
    439.58/660.57 = 423.38/x
  3. Step 3: Cross multiply
    439.58x = 660.57 × 423.38
  4. Step 4: Simplify right side
    439.58x = 279,672.13
  5. Step 5: Solve for x
    x = 279,672.13/439.58
  6. Step 6: Final answer
    x = 636.23

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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.