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Finding the Fourth Proportional to 491.58, 679.11 and 449.34

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Solution

The fourth proportional to 491.58, 679.11 and 449.34 is: 620.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.58 : 679.11 = 449.34 : x
  2. Step 2: Convert to fraction form
    491.58/679.11 = 449.34/x
  3. Step 3: Cross multiply
    491.58x = 679.11 × 449.34
  4. Step 4: Simplify right side
    491.58x = 305,151.29
  5. Step 5: Solve for x
    x = 305,151.29/491.58
  6. Step 6: Final answer
    x = 620.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.