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Finding the Fourth Proportional to 2,678.70, 4,018.50 and 829.38

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Solution

The fourth proportional to 2,678.70, 4,018.50 and 829.38 is: 1,244.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,678.70 : 4,018.50 = 829.38 : x
  2. Step 2: Convert to fraction form
    2,678.70/4,018.50 = 829.38/x
  3. Step 3: Cross multiply
    2,678.70x = 4,018.50 × 829.38
  4. Step 4: Simplify right side
    2,678.70x = 3,332,863.53
  5. Step 5: Solve for x
    x = 3,332,863.53/2,678.70
  6. Step 6: Final answer
    x = 1,244.21

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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.