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Finding the Fourth Proportional to 491.09, 736.91 and 198.72

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Solution

The fourth proportional to 491.09, 736.91 and 198.72 is: 298.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.09 : 736.91 = 198.72 : x
  2. Step 2: Convert to fraction form
    491.09/736.91 = 198.72/x
  3. Step 3: Cross multiply
    491.09x = 736.91 × 198.72
  4. Step 4: Simplify right side
    491.09x = 146,438.51
  5. Step 5: Solve for x
    x = 146,438.51/491.09
  6. Step 6: Final answer
    x = 298.19

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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.