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Finding the Fourth Proportional to 815.36, 1,222.79 and 328.14

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Solution

The fourth proportional to 815.36, 1,222.79 and 328.14 is: 492.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.36 : 1,222.79 = 328.14 : x
  2. Step 2: Convert to fraction form
    815.36/1,222.79 = 328.14/x
  3. Step 3: Cross multiply
    815.36x = 1,222.79 × 328.14
  4. Step 4: Simplify right side
    815.36x = 401,244.67
  5. Step 5: Solve for x
    x = 401,244.67/815.36
  6. Step 6: Final answer
    x = 492.11

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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.