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Finding the Fourth Proportional to 351.88, 485.57 and 218.90

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Solution

The fourth proportional to 351.88, 485.57 and 218.90 is: 302.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.88 : 485.57 = 218.90 : x
  2. Step 2: Convert to fraction form
    351.88/485.57 = 218.90/x
  3. Step 3: Cross multiply
    351.88x = 485.57 × 218.90
  4. Step 4: Simplify right side
    351.88x = 106,293.04
  5. Step 5: Solve for x
    x = 106,293.04/351.88
  6. Step 6: Final answer
    x = 302.07

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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.