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Finding the Fourth Proportional to 815.72, 1,223.60 and 353.21

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Solution

The fourth proportional to 815.72, 1,223.60 and 353.21 is: 529.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.72 : 1,223.60 = 353.21 : x
  2. Step 2: Convert to fraction form
    815.72/1,223.60 = 353.21/x
  3. Step 3: Cross multiply
    815.72x = 1,223.60 × 353.21
  4. Step 4: Simplify right side
    815.72x = 432,187.76
  5. Step 5: Solve for x
    x = 432,187.76/815.72
  6. Step 6: Final answer
    x = 529.82

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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.