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Finding the Fourth Proportional to 490.86, 736.49 and 216.81

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Solution

The fourth proportional to 490.86, 736.49 and 216.81 is: 325.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.86 : 736.49 = 216.81 : x
  2. Step 2: Convert to fraction form
    490.86/736.49 = 216.81/x
  3. Step 3: Cross multiply
    490.86x = 736.49 × 216.81
  4. Step 4: Simplify right side
    490.86x = 159,678.40
  5. Step 5: Solve for x
    x = 159,678.40/490.86
  6. Step 6: Final answer
    x = 325.30

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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.