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Finding the Fourth Proportional to 814.50, 1,220.83 and 403.93

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Solution

The fourth proportional to 814.50, 1,220.83 and 403.93 is: 605.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.50 : 1,220.83 = 403.93 : x
  2. Step 2: Convert to fraction form
    814.50/1,220.83 = 403.93/x
  3. Step 3: Cross multiply
    814.50x = 1,220.83 × 403.93
  4. Step 4: Simplify right side
    814.50x = 493,129.86
  5. Step 5: Solve for x
    x = 493,129.86/814.50
  6. Step 6: Final answer
    x = 605.44

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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.