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Finding the Fourth Proportional to 638.32, 879.56 and 513.48

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Solution

The fourth proportional to 638.32, 879.56 and 513.48 is: 707.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.32 : 879.56 = 513.48 : x
  2. Step 2: Convert to fraction form
    638.32/879.56 = 513.48/x
  3. Step 3: Cross multiply
    638.32x = 879.56 × 513.48
  4. Step 4: Simplify right side
    638.32x = 451,636.47
  5. Step 5: Solve for x
    x = 451,636.47/638.32
  6. Step 6: Final answer
    x = 707.54

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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.