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Finding the Fourth Proportional to 486.40, 729.45 and 161.69

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Solution

The fourth proportional to 486.40, 729.45 and 161.69 is: 242.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.40 : 729.45 = 161.69 : x
  2. Step 2: Convert to fraction form
    486.40/729.45 = 161.69/x
  3. Step 3: Cross multiply
    486.40x = 729.45 × 161.69
  4. Step 4: Simplify right side
    486.40x = 117,944.77
  5. Step 5: Solve for x
    x = 117,944.77/486.40
  6. Step 6: Final answer
    x = 242.49

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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.