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Finding the Fourth Proportional to 486.19, 728.97 and 255.13

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Solution

The fourth proportional to 486.19, 728.97 and 255.13 is: 382.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.19 : 728.97 = 255.13 : x
  2. Step 2: Convert to fraction form
    486.19/728.97 = 255.13/x
  3. Step 3: Cross multiply
    486.19x = 728.97 × 255.13
  4. Step 4: Simplify right side
    486.19x = 185,982.12
  5. Step 5: Solve for x
    x = 185,982.12/486.19
  6. Step 6: Final answer
    x = 382.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.