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Finding the Fourth Proportional to 829.62, 1,149.48 and 815.04

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Solution

The fourth proportional to 829.62, 1,149.48 and 815.04 is: 1,129.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.62 : 1,149.48 = 815.04 : x
  2. Step 2: Convert to fraction form
    829.62/1,149.48 = 815.04/x
  3. Step 3: Cross multiply
    829.62x = 1,149.48 × 815.04
  4. Step 4: Simplify right side
    829.62x = 936,872.18
  5. Step 5: Solve for x
    x = 936,872.18/829.62
  6. Step 6: Final answer
    x = 1,129.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.