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Finding the Fourth Proportional to 814.30, 1,221.47 and 266.54

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Solution

The fourth proportional to 814.30, 1,221.47 and 266.54 is: 399.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.30 : 1,221.47 = 266.54 : x
  2. Step 2: Convert to fraction form
    814.30/1,221.47 = 266.54/x
  3. Step 3: Cross multiply
    814.30x = 1,221.47 × 266.54
  4. Step 4: Simplify right side
    814.30x = 325,570.61
  5. Step 5: Solve for x
    x = 325,570.61/814.30
  6. Step 6: Final answer
    x = 399.82

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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.