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Finding the Fourth Proportional to 372.69, 513.84 and 306.21

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Solution

The fourth proportional to 372.69, 513.84 and 306.21 is: 422.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.69 : 513.84 = 306.21 : x
  2. Step 2: Convert to fraction form
    372.69/513.84 = 306.21/x
  3. Step 3: Cross multiply
    372.69x = 513.84 × 306.21
  4. Step 4: Simplify right side
    372.69x = 157,342.95
  5. Step 5: Solve for x
    x = 157,342.95/372.69
  6. Step 6: Final answer
    x = 422.18

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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.