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Finding the Fourth Proportional to 486.71, 729.80 and 255.03

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Solution

The fourth proportional to 486.71, 729.80 and 255.03 is: 382.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.71 : 729.80 = 255.03 : x
  2. Step 2: Convert to fraction form
    486.71/729.80 = 255.03/x
  3. Step 3: Cross multiply
    486.71x = 729.80 × 255.03
  4. Step 4: Simplify right side
    486.71x = 186,120.89
  5. Step 5: Solve for x
    x = 186,120.89/486.71
  6. Step 6: Final answer
    x = 382.41

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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.