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Finding the Fourth Proportional to 486.46, 729.64 and 280.89

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Solution

The fourth proportional to 486.46, 729.64 and 280.89 is: 421.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.46 : 729.64 = 280.89 : x
  2. Step 2: Convert to fraction form
    486.46/729.64 = 280.89/x
  3. Step 3: Cross multiply
    486.46x = 729.64 × 280.89
  4. Step 4: Simplify right side
    486.46x = 204,948.58
  5. Step 5: Solve for x
    x = 204,948.58/486.46
  6. Step 6: Final answer
    x = 421.31

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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.