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Finding the Fourth Proportional to 814.09, 1,220.80 and 266.13

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Solution

The fourth proportional to 814.09, 1,220.80 and 266.13 is: 399.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.09 : 1,220.80 = 266.13 : x
  2. Step 2: Convert to fraction form
    814.09/1,220.80 = 266.13/x
  3. Step 3: Cross multiply
    814.09x = 1,220.80 × 266.13
  4. Step 4: Simplify right side
    814.09x = 324,891.50
  5. Step 5: Solve for x
    x = 324,891.50/814.09
  6. Step 6: Final answer
    x = 399.09

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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.