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Finding the Fourth Proportional to 486.90, 730.38 and 243.18

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Solution

The fourth proportional to 486.90, 730.38 and 243.18 is: 364.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.90 : 730.38 = 243.18 : x
  2. Step 2: Convert to fraction form
    486.90/730.38 = 243.18/x
  3. Step 3: Cross multiply
    486.90x = 730.38 × 243.18
  4. Step 4: Simplify right side
    486.90x = 177,613.81
  5. Step 5: Solve for x
    x = 177,613.81/486.90
  6. Step 6: Final answer
    x = 364.78

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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.