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Finding the Fourth Proportional to 513.72, 708.71 and 303.91

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Solution

The fourth proportional to 513.72, 708.71 and 303.91 is: 419.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.72 : 708.71 = 303.91 : x
  2. Step 2: Convert to fraction form
    513.72/708.71 = 303.91/x
  3. Step 3: Cross multiply
    513.72x = 708.71 × 303.91
  4. Step 4: Simplify right side
    513.72x = 215,380.76
  5. Step 5: Solve for x
    x = 215,380.76/513.72
  6. Step 6: Final answer
    x = 419.26

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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.