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Finding the Fourth Proportional to 1,293.20, 1,938.48 and 829.64

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Solution

The fourth proportional to 1,293.20, 1,938.48 and 829.64 is: 1,243.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.20 : 1,938.48 = 829.64 : x
  2. Step 2: Convert to fraction form
    1,293.20/1,938.48 = 829.64/x
  3. Step 3: Cross multiply
    1,293.20x = 1,938.48 × 829.64
  4. Step 4: Simplify right side
    1,293.20x = 1,608,240.55
  5. Step 5: Solve for x
    x = 1,608,240.55/1,293.20
  6. Step 6: Final answer
    x = 1,243.61

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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.