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Finding the Fourth Proportional to 486.42, 729.62 and 121.21

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Solution

The fourth proportional to 486.42, 729.62 and 121.21 is: 181.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.42 : 729.62 = 121.21 : x
  2. Step 2: Convert to fraction form
    486.42/729.62 = 121.21/x
  3. Step 3: Cross multiply
    486.42x = 729.62 × 121.21
  4. Step 4: Simplify right side
    486.42x = 88,432.99
  5. Step 5: Solve for x
    x = 88,432.99/486.42
  6. Step 6: Final answer
    x = 181.80

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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.