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Finding the Fourth Proportional to 513.85, 708.99 and 317.47

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Solution

The fourth proportional to 513.85, 708.99 and 317.47 is: 438.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.85 : 708.99 = 317.47 : x
  2. Step 2: Convert to fraction form
    513.85/708.99 = 317.47/x
  3. Step 3: Cross multiply
    513.85x = 708.99 × 317.47
  4. Step 4: Simplify right side
    513.85x = 225,083.06
  5. Step 5: Solve for x
    x = 225,083.06/513.85
  6. Step 6: Final answer
    x = 438.03

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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.