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Finding the Fourth Proportional to 491.38, 678.02 and 325.66

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Solution

The fourth proportional to 491.38, 678.02 and 325.66 is: 449.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.38 : 678.02 = 325.66 : x
  2. Step 2: Convert to fraction form
    491.38/678.02 = 325.66/x
  3. Step 3: Cross multiply
    491.38x = 678.02 × 325.66
  4. Step 4: Simplify right side
    491.38x = 220,803.99
  5. Step 5: Solve for x
    x = 220,803.99/491.38
  6. Step 6: Final answer
    x = 449.35

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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.