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Finding the Fourth Proportional to 372.11, 513.56 and 309.83

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Solution

The fourth proportional to 372.11, 513.56 and 309.83 is: 427.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.11 : 513.56 = 309.83 : x
  2. Step 2: Convert to fraction form
    372.11/513.56 = 309.83/x
  3. Step 3: Cross multiply
    372.11x = 513.56 × 309.83
  4. Step 4: Simplify right side
    372.11x = 159,116.29
  5. Step 5: Solve for x
    x = 159,116.29/372.11
  6. Step 6: Final answer
    x = 427.61

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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.