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Finding the Fourth Proportional to 815.92, 1,223.12 and 328.84

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Solution

The fourth proportional to 815.92, 1,223.12 and 328.84 is: 492.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.92 : 1,223.12 = 328.84 : x
  2. Step 2: Convert to fraction form
    815.92/1,223.12 = 328.84/x
  3. Step 3: Cross multiply
    815.92x = 1,223.12 × 328.84
  4. Step 4: Simplify right side
    815.92x = 402,210.78
  5. Step 5: Solve for x
    x = 402,210.78/815.92
  6. Step 6: Final answer
    x = 492.95

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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.