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Finding the Fourth Proportional to 486.18, 729.12 and 280.84

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Solution

The fourth proportional to 486.18, 729.12 and 280.84 is: 421.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.18 : 729.12 = 280.84 : x
  2. Step 2: Convert to fraction form
    486.18/729.12 = 280.84/x
  3. Step 3: Cross multiply
    486.18x = 729.12 × 280.84
  4. Step 4: Simplify right side
    486.18x = 204,766.06
  5. Step 5: Solve for x
    x = 204,766.06/486.18
  6. Step 6: Final answer
    x = 421.17

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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.