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Finding the Fourth Proportional to 351.88, 485.85 and 221.08

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Solution

The fourth proportional to 351.88, 485.85 and 221.08 is: 305.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.88 : 485.85 = 221.08 : x
  2. Step 2: Convert to fraction form
    351.88/485.85 = 221.08/x
  3. Step 3: Cross multiply
    351.88x = 485.85 × 221.08
  4. Step 4: Simplify right side
    351.88x = 107,411.72
  5. Step 5: Solve for x
    x = 107,411.72/351.88
  6. Step 6: Final answer
    x = 305.25

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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.