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Finding the Fourth Proportional to 815.08, 1,222.80 and 382

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Solution

The fourth proportional to 815.08, 1,222.80 and 382 is: 573.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.08 : 1,222.80 = 382 : x
  2. Step 2: Convert to fraction form
    815.08/1,222.80 = 382/x
  3. Step 3: Cross multiply
    815.08x = 1,222.80 × 382
  4. Step 4: Simplify right side
    815.08x = 467,109.60
  5. Step 5: Solve for x
    x = 467,109.60/815.08
  6. Step 6: Final answer
    x = 573.08

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.