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Finding the Fourth Proportional to 372.31, 513.33 and 305.84

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Solution

The fourth proportional to 372.31, 513.33 and 305.84 is: 421.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.31 : 513.33 = 305.84 : x
  2. Step 2: Convert to fraction form
    372.31/513.33 = 305.84/x
  3. Step 3: Cross multiply
    372.31x = 513.33 × 305.84
  4. Step 4: Simplify right side
    372.31x = 156,996.98
  5. Step 5: Solve for x
    x = 156,996.98/372.31
  6. Step 6: Final answer
    x = 421.69

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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.