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Finding the Fourth Proportional to 320.31, 441.73 and 220.57

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Solution

The fourth proportional to 320.31, 441.73 and 220.57 is: 304.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.31 : 441.73 = 220.57 : x
  2. Step 2: Convert to fraction form
    320.31/441.73 = 220.57/x
  3. Step 3: Cross multiply
    320.31x = 441.73 × 220.57
  4. Step 4: Simplify right side
    320.31x = 97,431.89
  5. Step 5: Solve for x
    x = 97,431.89/320.31
  6. Step 6: Final answer
    x = 304.18

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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.