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Finding the Fourth Proportional to 814.60, 1,222.26 and 328.60

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Solution

The fourth proportional to 814.60, 1,222.26 and 328.60 is: 493.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.60 : 1,222.26 = 328.60 : x
  2. Step 2: Convert to fraction form
    814.60/1,222.26 = 328.60/x
  3. Step 3: Cross multiply
    814.60x = 1,222.26 × 328.60
  4. Step 4: Simplify right side
    814.60x = 401,634.64
  5. Step 5: Solve for x
    x = 401,634.64/814.60
  6. Step 6: Final answer
    x = 493.05

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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.