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Finding the Fourth Proportional to 491.81, 678.11 and 325.89

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Solution

The fourth proportional to 491.81, 678.11 and 325.89 is: 449.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.81 : 678.11 = 325.89 : x
  2. Step 2: Convert to fraction form
    491.81/678.11 = 325.89/x
  3. Step 3: Cross multiply
    491.81x = 678.11 × 325.89
  4. Step 4: Simplify right side
    491.81x = 220,987.64
  5. Step 5: Solve for x
    x = 220,987.64/491.81
  6. Step 6: Final answer
    x = 449.34

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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.