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Finding the Fourth Proportional to 815.46, 1,222.38 and 382.68

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Solution

The fourth proportional to 815.46, 1,222.38 and 382.68 is: 573.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.46 : 1,222.38 = 382.68 : x
  2. Step 2: Convert to fraction form
    815.46/1,222.38 = 382.68/x
  3. Step 3: Cross multiply
    815.46x = 1,222.38 × 382.68
  4. Step 4: Simplify right side
    815.46x = 467,780.38
  5. Step 5: Solve for x
    x = 467,780.38/815.46
  6. Step 6: Final answer
    x = 573.64

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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.