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Finding the Fourth Proportional to 490.28, 675.96 and 315.32

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Solution

The fourth proportional to 490.28, 675.96 and 315.32 is: 434.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.28 : 675.96 = 315.32 : x
  2. Step 2: Convert to fraction form
    490.28/675.96 = 315.32/x
  3. Step 3: Cross multiply
    490.28x = 675.96 × 315.32
  4. Step 4: Simplify right side
    490.28x = 213,143.71
  5. Step 5: Solve for x
    x = 213,143.71/490.28
  6. Step 6: Final answer
    x = 434.74

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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.