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Finding the Fourth Proportional to 490.16, 675.86 and 312.88

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Solution

The fourth proportional to 490.16, 675.86 and 312.88 is: 431.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.16 : 675.86 = 312.88 : x
  2. Step 2: Convert to fraction form
    490.16/675.86 = 312.88/x
  3. Step 3: Cross multiply
    490.16x = 675.86 × 312.88
  4. Step 4: Simplify right side
    490.16x = 211,463.08
  5. Step 5: Solve for x
    x = 211,463.08/490.16
  6. Step 6: Final answer
    x = 431.42

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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.