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Finding the Fourth Proportional to 230.88, 319.21 and 220.68

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Solution

The fourth proportional to 230.88, 319.21 and 220.68 is: 305.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.88 : 319.21 = 220.68 : x
  2. Step 2: Convert to fraction form
    230.88/319.21 = 220.68/x
  3. Step 3: Cross multiply
    230.88x = 319.21 × 220.68
  4. Step 4: Simplify right side
    230.88x = 70,443.26
  5. Step 5: Solve for x
    x = 70,443.26/230.88
  6. Step 6: Final answer
    x = 305.11

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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.