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Finding the Fourth Proportional to 638.88, 879.48 and 573.36

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Solution

The fourth proportional to 638.88, 879.48 and 573.36 is: 789.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.88 : 879.48 = 573.36 : x
  2. Step 2: Convert to fraction form
    638.88/879.48 = 573.36/x
  3. Step 3: Cross multiply
    638.88x = 879.48 × 573.36
  4. Step 4: Simplify right side
    638.88x = 504,258.65
  5. Step 5: Solve for x
    x = 504,258.65/638.88
  6. Step 6: Final answer
    x = 789.29

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1.5x scale

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.