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Finding the Fourth Proportional to 486.40, 729.40 and 161.68

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Solution

The fourth proportional to 486.40, 729.40 and 161.68 is: 242.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.40 : 729.40 = 161.68 : x
  2. Step 2: Convert to fraction form
    486.40/729.40 = 161.68/x
  3. Step 3: Cross multiply
    486.40x = 729.40 × 161.68
  4. Step 4: Simplify right side
    486.40x = 117,929.39
  5. Step 5: Solve for x
    x = 117,929.39/486.40
  6. Step 6: Final answer
    x = 242.45

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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.