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Finding the Fourth Proportional to 486.50, 729.08 and 281.14

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Solution

The fourth proportional to 486.50, 729.08 and 281.14 is: 421.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.50 : 729.08 = 281.14 : x
  2. Step 2: Convert to fraction form
    486.50/729.08 = 281.14/x
  3. Step 3: Cross multiply
    486.50x = 729.08 × 281.14
  4. Step 4: Simplify right side
    486.50x = 204,973.55
  5. Step 5: Solve for x
    x = 204,973.55/486.50
  6. Step 6: Final answer
    x = 421.32

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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.