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Finding the Fourth Proportional to 815.34, 1,125.29 and 483.85

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Solution

The fourth proportional to 815.34, 1,125.29 and 483.85 is: 667.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.34 : 1,125.29 = 483.85 : x
  2. Step 2: Convert to fraction form
    815.34/1,125.29 = 483.85/x
  3. Step 3: Cross multiply
    815.34x = 1,125.29 × 483.85
  4. Step 4: Simplify right side
    815.34x = 544,469.96
  5. Step 5: Solve for x
    x = 544,469.96/815.34
  6. Step 6: Final answer
    x = 667.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.