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Finding the Fourth Proportional to 513.44, 708.20 and 389.58

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Solution

The fourth proportional to 513.44, 708.20 and 389.58 is: 537.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.44 : 708.20 = 389.58 : x
  2. Step 2: Convert to fraction form
    513.44/708.20 = 389.58/x
  3. Step 3: Cross multiply
    513.44x = 708.20 × 389.58
  4. Step 4: Simplify right side
    513.44x = 275,900.56
  5. Step 5: Solve for x
    x = 275,900.56/513.44
  6. Step 6: Final answer
    x = 537.36

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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.