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Finding the Fourth Proportional to 486.45, 729.18 and 161.55

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Solution

The fourth proportional to 486.45, 729.18 and 161.55 is: 242.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.45 : 729.18 = 161.55 : x
  2. Step 2: Convert to fraction form
    486.45/729.18 = 161.55/x
  3. Step 3: Cross multiply
    486.45x = 729.18 × 161.55
  4. Step 4: Simplify right side
    486.45x = 117,799.03
  5. Step 5: Solve for x
    x = 117,799.03/486.45
  6. Step 6: Final answer
    x = 242.16

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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.