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Finding the Fourth Proportional to 490.02, 675.87 and 312.81

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Solution

The fourth proportional to 490.02, 675.87 and 312.81 is: 431.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.02 : 675.87 = 312.81 : x
  2. Step 2: Convert to fraction form
    490.02/675.87 = 312.81/x
  3. Step 3: Cross multiply
    490.02x = 675.87 × 312.81
  4. Step 4: Simplify right side
    490.02x = 211,418.89
  5. Step 5: Solve for x
    x = 211,418.89/490.02
  6. Step 6: Final answer
    x = 431.45

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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.