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Finding the Fourth Proportional to 814.86, 1,221.86 and 266.68

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Solution

The fourth proportional to 814.86, 1,221.86 and 266.68 is: 399.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.86 : 1,221.86 = 266.68 : x
  2. Step 2: Convert to fraction form
    814.86/1,221.86 = 266.68/x
  3. Step 3: Cross multiply
    814.86x = 1,221.86 × 266.68
  4. Step 4: Simplify right side
    814.86x = 325,845.62
  5. Step 5: Solve for x
    x = 325,845.62/814.86
  6. Step 6: Final answer
    x = 399.88

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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.