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Finding the Fourth Proportional to 814.70, 1,222.14 and 398.48

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Solution

The fourth proportional to 814.70, 1,222.14 and 398.48 is: 597.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.70 : 1,222.14 = 398.48 : x
  2. Step 2: Convert to fraction form
    814.70/1,222.14 = 398.48/x
  3. Step 3: Cross multiply
    814.70x = 1,222.14 × 398.48
  4. Step 4: Simplify right side
    814.70x = 486,998.35
  5. Step 5: Solve for x
    x = 486,998.35/814.70
  6. Step 6: Final answer
    x = 597.76

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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.