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Finding the Fourth Proportional to 331.20, 436.80 and 331.20

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Solution

The fourth proportional to 331.20, 436.80 and 331.20 is: 436.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.20 : 436.80 = 331.20 : x
  2. Step 2: Convert to fraction form
    331.20/436.80 = 331.20/x
  3. Step 3: Cross multiply
    331.20x = 436.80 × 331.20
  4. Step 4: Simplify right side
    331.20x = 144,668.16
  5. Step 5: Solve for x
    x = 144,668.16/331.20
  6. Step 6: Final answer
    x = 436.80

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.