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Finding the Fourth Proportional to 814.07, 1,221.20 and 266.10

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Solution

The fourth proportional to 814.07, 1,221.20 and 266.10 is: 399.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.07 : 1,221.20 = 266.10 : x
  2. Step 2: Convert to fraction form
    814.07/1,221.20 = 266.10/x
  3. Step 3: Cross multiply
    814.07x = 1,221.20 × 266.10
  4. Step 4: Simplify right side
    814.07x = 324,959.99
  5. Step 5: Solve for x
    x = 324,959.99/814.07
  6. Step 6: Final answer
    x = 399.18

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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.