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Finding the Fourth Proportional to 486.30, 729.46 and 121.08

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Solution

The fourth proportional to 486.30, 729.46 and 121.08 is: 181.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.30 : 729.46 = 121.08 : x
  2. Step 2: Convert to fraction form
    486.30/729.46 = 121.08/x
  3. Step 3: Cross multiply
    486.30x = 729.46 × 121.08
  4. Step 4: Simplify right side
    486.30x = 88,323.02
  5. Step 5: Solve for x
    x = 88,323.02/486.30
  6. Step 6: Final answer
    x = 181.62

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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.