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Finding the Fourth Proportional to 513.20, 708.30 and 303.50

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Solution

The fourth proportional to 513.20, 708.30 and 303.50 is: 418.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.20 : 708.30 = 303.50 : x
  2. Step 2: Convert to fraction form
    513.20/708.30 = 303.50/x
  3. Step 3: Cross multiply
    513.20x = 708.30 × 303.50
  4. Step 4: Simplify right side
    513.20x = 214,965.51
  5. Step 5: Solve for x
    x = 214,965.51/513.20
  6. Step 6: Final answer
    x = 418.88

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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.