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Finding the Fourth Proportional to 818.99, 1,228.50 and 511.73

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Solution

The fourth proportional to 818.99, 1,228.50 and 511.73 is: 767.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.99 : 1,228.50 = 511.73 : x
  2. Step 2: Convert to fraction form
    818.99/1,228.50 = 511.73/x
  3. Step 3: Cross multiply
    818.99x = 1,228.50 × 511.73
  4. Step 4: Simplify right side
    818.99x = 628,654.16
  5. Step 5: Solve for x
    x = 628,654.16/818.99
  6. Step 6: Final answer
    x = 767.60

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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.