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Finding the Fourth Proportional to 815.07, 1,222.61 and 328.46

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Solution

The fourth proportional to 815.07, 1,222.61 and 328.46 is: 492.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.07 : 1,222.61 = 328.46 : x
  2. Step 2: Convert to fraction form
    815.07/1,222.61 = 328.46/x
  3. Step 3: Cross multiply
    815.07x = 1,222.61 × 328.46
  4. Step 4: Simplify right side
    815.07x = 401,570.73
  5. Step 5: Solve for x
    x = 401,570.73/815.07
  6. Step 6: Final answer
    x = 492.68

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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.