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Finding the Fourth Proportional to 814.10, 1,221.10 and 351.55

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Solution

The fourth proportional to 814.10, 1,221.10 and 351.55 is: 527.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.10 : 1,221.10 = 351.55 : x
  2. Step 2: Convert to fraction form
    814.10/1,221.10 = 351.55/x
  3. Step 3: Cross multiply
    814.10x = 1,221.10 × 351.55
  4. Step 4: Simplify right side
    814.10x = 429,280.64
  5. Step 5: Solve for x
    x = 429,280.64/814.10
  6. Step 6: Final answer
    x = 527.31

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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.