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Finding the Fourth Proportional to 814.02, 1,221.09 and 266.07

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Solution

The fourth proportional to 814.02, 1,221.09 and 266.07 is: 399.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.02 : 1,221.09 = 266.07 : x
  2. Step 2: Convert to fraction form
    814.02/1,221.09 = 266.07/x
  3. Step 3: Cross multiply
    814.02x = 1,221.09 × 266.07
  4. Step 4: Simplify right side
    814.02x = 324,895.42
  5. Step 5: Solve for x
    x = 324,895.42/814.02
  6. Step 6: Final answer
    x = 399.12

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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.