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Finding the Fourth Proportional to 815.24, 1,223.20 and 352.78

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Solution

The fourth proportional to 815.24, 1,223.20 and 352.78 is: 529.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.24 : 1,223.20 = 352.78 : x
  2. Step 2: Convert to fraction form
    815.24/1,223.20 = 352.78/x
  3. Step 3: Cross multiply
    815.24x = 1,223.20 × 352.78
  4. Step 4: Simplify right side
    815.24x = 431,520.50
  5. Step 5: Solve for x
    x = 431,520.50/815.24
  6. Step 6: Final answer
    x = 529.32

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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.