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Finding the Fourth Proportional to 829.28, 1,143.96 and 479.84

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Solution

The fourth proportional to 829.28, 1,143.96 and 479.84 is: 661.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.28 : 1,143.96 = 479.84 : x
  2. Step 2: Convert to fraction form
    829.28/1,143.96 = 479.84/x
  3. Step 3: Cross multiply
    829.28x = 1,143.96 × 479.84
  4. Step 4: Simplify right side
    829.28x = 548,917.77
  5. Step 5: Solve for x
    x = 548,917.77/829.28
  6. Step 6: Final answer
    x = 661.92

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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.