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Finding the Fourth Proportional to 814.94, 1,221.91 and 320.76

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Solution

The fourth proportional to 814.94, 1,221.91 and 320.76 is: 480.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.94 : 1,221.91 = 320.76 : x
  2. Step 2: Convert to fraction form
    814.94/1,221.91 = 320.76/x
  3. Step 3: Cross multiply
    814.94x = 1,221.91 × 320.76
  4. Step 4: Simplify right side
    814.94x = 391,939.85
  5. Step 5: Solve for x
    x = 391,939.85/814.94
  6. Step 6: Final answer
    x = 480.94

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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.