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Finding the Fourth Proportional to 815.81, 1,223.67 and 328.73

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Solution

The fourth proportional to 815.81, 1,223.67 and 328.73 is: 493.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.81 : 1,223.67 = 328.73 : x
  2. Step 2: Convert to fraction form
    815.81/1,223.67 = 328.73/x
  3. Step 3: Cross multiply
    815.81x = 1,223.67 × 328.73
  4. Step 4: Simplify right side
    815.81x = 402,257.04
  5. Step 5: Solve for x
    x = 402,257.04/815.81
  6. Step 6: Final answer
    x = 493.08

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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.