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Finding the Fourth Proportional to 486.36, 729.59 and 193.79

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Solution

The fourth proportional to 486.36, 729.59 and 193.79 is: 290.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.36 : 729.59 = 193.79 : x
  2. Step 2: Convert to fraction form
    486.36/729.59 = 193.79/x
  3. Step 3: Cross multiply
    486.36x = 729.59 × 193.79
  4. Step 4: Simplify right side
    486.36x = 141,389.07
  5. Step 5: Solve for x
    x = 141,389.07/486.36
  6. Step 6: Final answer
    x = 290.71

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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.