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Finding the Fourth Proportional to 486.12, 729.09 and 161.45

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Solution

The fourth proportional to 486.12, 729.09 and 161.45 is: 242.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.12 : 729.09 = 161.45 : x
  2. Step 2: Convert to fraction form
    486.12/729.09 = 161.45/x
  3. Step 3: Cross multiply
    486.12x = 729.09 × 161.45
  4. Step 4: Simplify right side
    486.12x = 117,711.58
  5. Step 5: Solve for x
    x = 117,711.58/486.12
  6. Step 6: Final answer
    x = 242.15

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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.