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Finding the Fourth Proportional to 486.72, 730.24 and 198.40

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Solution

The fourth proportional to 486.72, 730.24 and 198.40 is: 297.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.72 : 730.24 = 198.40 : x
  2. Step 2: Convert to fraction form
    486.72/730.24 = 198.40/x
  3. Step 3: Cross multiply
    486.72x = 730.24 × 198.40
  4. Step 4: Simplify right side
    486.72x = 144,879.62
  5. Step 5: Solve for x
    x = 144,879.62/486.72
  6. Step 6: Final answer
    x = 297.67

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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.