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Finding the Fourth Proportional to 486.48, 729.72 and 121.28

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Solution

The fourth proportional to 486.48, 729.72 and 121.28 is: 181.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.48 : 729.72 = 121.28 : x
  2. Step 2: Convert to fraction form
    486.48/729.72 = 121.28/x
  3. Step 3: Cross multiply
    486.48x = 729.72 × 121.28
  4. Step 4: Simplify right side
    486.48x = 88,496.79
  5. Step 5: Solve for x
    x = 88,496.79/486.48
  6. Step 6: Final answer
    x = 181.91

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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.