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Finding the Fourth Proportional to 829.40, 1,246.78 and 769.24

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Solution

The fourth proportional to 829.40, 1,246.78 and 769.24 is: 1,156.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.40 : 1,246.78 = 769.24 : x
  2. Step 2: Convert to fraction form
    829.40/1,246.78 = 769.24/x
  3. Step 3: Cross multiply
    829.40x = 1,246.78 × 769.24
  4. Step 4: Simplify right side
    829.40x = 959,073.05
  5. Step 5: Solve for x
    x = 959,073.05/829.40
  6. Step 6: Final answer
    x = 1,156.35

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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.