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Finding the Fourth Proportional to 814.18, 1,221.36 and 266.26

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Solution

The fourth proportional to 814.18, 1,221.36 and 266.26 is: 399.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.18 : 1,221.36 = 266.26 : x
  2. Step 2: Convert to fraction form
    814.18/1,221.36 = 266.26/x
  3. Step 3: Cross multiply
    814.18x = 1,221.36 × 266.26
  4. Step 4: Simplify right side
    814.18x = 325,199.31
  5. Step 5: Solve for x
    x = 325,199.31/814.18
  6. Step 6: Final answer
    x = 399.42

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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.