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Finding the Fourth Proportional to 486, 729.63 and 280.71

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Solution

The fourth proportional to 486, 729.63 and 280.71 is: 421.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    486 : 729.63 = 280.71 : x
  2. Step 2: Convert to fraction form
    486/729.63 = 280.71/x
  3. Step 3: Cross multiply
    486x = 729.63 × 280.71
  4. Step 4: Simplify right side
    486x = 204,814.44
  5. Step 5: Solve for x
    x = 204,814.44/486
  6. Step 6: Final answer
    x = 421.43

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