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Finding the Fourth Proportional to 513.15, 708.17 and 289.10

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Solution

The fourth proportional to 513.15, 708.17 and 289.10 is: 398.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.15 : 708.17 = 289.10 : x
  2. Step 2: Convert to fraction form
    513.15/708.17 = 289.10/x
  3. Step 3: Cross multiply
    513.15x = 708.17 × 289.10
  4. Step 4: Simplify right side
    513.15x = 204,731.95
  5. Step 5: Solve for x
    x = 204,731.95/513.15
  6. Step 6: Final answer
    x = 398.97

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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.